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Hello, this is Sanago, master of the 3D pen.
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Have you all seen the Demon Slayer movie?
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I ran to the theater as soon as it opened and watched it.
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It was fun.
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So today,
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I’m going to make my favorite character
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from Demon Slayer: Zenitsu.
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Zenitsu is one of the main characters in Demon Slayer,
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and at first he shows up as a huge scaredy-cat,
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so I thought he was just the comic-relief guy,
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but in key moments he uses a powerful move called “Thunderclap and Flash,”
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showing off his unexpected charm—
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he’s even ranked No. 1 in the official popularity poll.
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I’ve attached the front-view frame to the side-view frame.
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And as always, I make
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the middle frames that connect the two.
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This outfit Zenitsu is wearing
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is the Demon Slayer Corps uniform.
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As you can tell from the title “Demon Slayer,”
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it’s an anime about fighting demons,
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and Zenitsu also belongs to the Corps.
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Zenitsu uses the Breath of Thunder,
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but unlike the other characters,
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he only knows the First Form, “Thunderclap and Flash”—
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in a way, a prodigy,
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a bit of an unusual character, you could say.
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And this is the pose right before he uses that skill.
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Now that the pose is set, I’ll start creating the surfaces.
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Wherever I think there should be a surface,
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I build a lattice-like framework.
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With the framework in, the form is taking shape.
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Kaminari no Kokyū…
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Bzzt—
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I’ve split Zenitsu in half.
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Because the pen can’t reach into every corner,
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I’m going to divide it into parts
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and make it like a snap-fit figure for easier work.
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I’ll insert a brass rod into a bearing,
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and use magnets to attach the parts easily.
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I’ll fix the hardware to the cut surfaces.
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I put two magnets in the waist to make it sturdy—
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the waist is important.
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For the arms as well,
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I embedded a pin connector so they don’t rotate.
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Now I can separate it like this and work on each section.
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To really fill in the surfaces,
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I’ll disassemble all the parts.
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When filling surfaces, think about clothing wrinkles
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and build them in three dimensions.
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For the leg with the bent knee,
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I made the pants look more crumpled.
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To capture a realistic texture,
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I wore baggy pants and tried copying Zenitsu’s pose,
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and I thought my thigh was going to rip.
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No wonder the Demon Slayer characters
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all have bulked-up bodies.
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I’ll assemble it to check if the wrinkles look natural.
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Not bad.
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Anyway, the fine details
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can be tweaked while finishing,
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so I’ll quickly refine with a soldering iron.
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Like a snake slipping over a wall,
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like butter on toast,
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I smooth the filament with a hot iron.
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For the face too, keeping the features in mind,
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I shape the curves as I refine.
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At this point I might be a soldering-iron master.
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You can also apply heat to the filament to create contours.
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Now I’ll make the hands.
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Roughly sketch hands proportional to the arms,
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clean them up with the iron,
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and carefully carve with a knife to shape them.
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Then attach a transparent “Doraemon hand”
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and connect it to the sleeve.
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With the connector inserted,
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fix it firmly inside the arm.
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Then reattach the cut sleeve.
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I’ll shape the left hand to grip the sword,
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and the right hand as if drawing the blade,
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so being able to separate them like this
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makes the work much easier.
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The hand shape really
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looks like it’s about to grab a sword, right?
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Likewise, fix it well and close it up.
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Now it’s looking pretty cool.
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Will it stand if I just put it on the floor like this?
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Will it…?
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Of course not.
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As I said, this pose requires a lot of lower-body strength,
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and filament doesn’t have that kind of strength,
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so I’ll borrow the power of magnets.
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Now it can stand
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on most metal surfaces.
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Do not use breathing techniques here—
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dust could get into your nostrils.
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Turn on the dust collector and sand diligently.
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If you sand too hard,
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the clothing wrinkles you worked so hard on will blur,
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so stop at a good point and switch to a fine sponge sander.
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You’ll have to touch it up again anyway.
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With a finishing tip, cleanly restore
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the blurred wrinkles and edges.
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The cloth tied at the ankles
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is called kyōhane (leg wraps).
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You probably didn’t wonder,
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but I had nothing else to say so I looked it up.
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After another round of finishing, it’s much cleaner, right?
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Now I’ll make Zenitsu’s hair.
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Wrap it well with masking tape
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so the filament will come off easily later,
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and make a hair mold first.
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Zenitsu’s hair looks like cut-up colored paper
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pasted on—a choppy mop, basically—
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so to set the base shape,
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I attached filament pieces to the mold.
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Apply heat to the attached pieces
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and turn that pinecone-like hairstyle
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into something at least human-ish.
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Still not very human, huh?
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This is just the mold.
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Fill the empty spaces with filament,
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and refine it with the iron.
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Once it’s roughly shaped, take it off and sand it.
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Likewise, after sanding, I’ll add back the details.
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And just like that, Zenitsu’s hair is made—
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the back hair, anyway.
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I’ll quickly make the bangs with the same method.
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Now it’s looking pretty Zenitsu-like, right?
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To make the hair detachable,
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I’m drilling holes for the connectors—
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something else came off.
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Zenitsu’s hair is tough.
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I fixed the back hair simply with a pin connector.
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I couldn’t bring myself to drill into his forehead,
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so I embedded magnets in advance for the bangs.
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Now I’ll make a haori, the traditional Japanese coat,
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as distinctive as the characters’ looks.
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Heat a thin, flattened sheet of filament,
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and when it gets floppy, dress it onto Zenitsu.
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This job hurts about as much as holding
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a stainless rice bowl at a mom-and-pop soup place for 10 seconds.
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It’s basically impossible for the average person.
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But I still can’t wear gloves,
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because I need the dexterity for delicate work.
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Please make sure you wear gloves.
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Once the haori’s shape is roughly set,
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I’ll clean the seams with the iron.
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Now I’ll make the Nichirin blade.
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I’ll cut up a bread knife to make it,
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but if the blade is longer than 15 cm,
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it violates the sword-possession law,
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so it has to be shorter.
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Even if it’s under 15 cm, if you fool around with it in public,
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you can be arrested regardless of length,
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so be careful.
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And actually, the intended use matters most—
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whatever it is, you must not harm others.
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Depending on the situation, even a neutral witch can be a weapon.
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Attach a template of Zenitsu’s Nichirin blade to the cut knife,
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and refine the shape precisely with a grinder.
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A Nichirin blade is the sword used by the Demon Slayer Corps.
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Each one’s form differs by person,
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but they’re all made from sun-imbued scarlet ore.
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To establish the edge,
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mark the center line of the blade face.
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Then, while feeling with your fingertips
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how the edge is forming, work delicately—
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like a master craftsman.
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It already looks cool,
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but if you polish the edge with a finer sandpaper,
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it’ll look even cooler.
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Looks like a sword made by a master, right?
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You’d never guess it used to be a bread knife.
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I’ll make the handle out of filament.
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It’s usually made of wood,
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but wood can split easily when it’s too small,
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so filament is more suitable.
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With a finishing tip, I’ll carve the pattern.
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I’m focusing all my attention on the sharp tip of the iron.
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The decorative piece between the handle and blade
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on a Japanese sword is called a tsuba.
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It also serves a practical purpose—preventing your hand
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from slipping onto the blade—
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but it’s decorative as well.
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Zenitsu’s tsuba is plainer than you might think.
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If it’s too flashy, it actually looks worse.
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Fit the tsuba onto the sword,
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and now I’ll make the scabbard.
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Zenitsu’s “Thunderclap and Flash” stance
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starts with the blade inside the scabbard,
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then drawing and striking in an instant—battojutsu.
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So I made it delicate enough
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to actually sheathe the sword.
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Zenitsu’s Nichirin blade is complete.
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Cool, right?
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At long last, it’s time to paint.
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Disassemble all the parts
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and apply primer.
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These days, I find brush painting more fun than spray painting,
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so I mainly use acrylic paints.
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They’re much cheaper, too.
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Though with all the focus, my neck’s becoming a turtle,
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so I might end up paying more in hospital bills.
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Zenitsu is so timid he faints in the middle of fights,
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but when he faints his combat power goes up,
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and he uses powerful skills unconsciously.
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So I drew him with his eyes closed.
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It hasn’t been long since my LASIK,
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so the delicate work was tough,
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but it wrapped up nicely.
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Assemble the painted parts.
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I’ll also paint the character 滅 (destroy) on the back.
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You can’t see it once the haori’s on,
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but it’s basically the spirit of the Corps,
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so of course it goes on.
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Finally, put on the haori,
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finish painting the haori,
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and the Zenitsu “box-cutter-for-packages” from Demon Slayer
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is complete.
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I’m sure you’ve all had packages arrive with no knife to open them.
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At times like that, you must have thought, “If only I had Demon Slayer…”
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At least once, right?
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Now, with this Zenitsu package-opening knife,
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you can open any parcel in the blink of an eye.
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Amazing, right?
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Breath of Unboxing—
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First Form.
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Wow, Neutral Witch!
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What do you mean, open the package without using a knife?
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That’s like clapping without using your hands.
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But this isn’t just any knife.
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It doesn’t say not to open it with a Nichirin blade,
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so it’s fine to open.
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Just like Zenitsu in the manga,
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with quick footwork,
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you can strike a Thunderclap-and-Flash pose anywhere.
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Originally, I should’ve etched yellow patterns onto the blade,
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but due to lack of skill, it turned into a regular sword.
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Still, its cutting ability is beyond a bread knife.
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We should test it, right?
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Here’s not a demon,
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but a cucumber to slice.
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Thunderclap and Flash!
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Huh?
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Thunderclap and Flash!
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Thundercl—!
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Ah, forget it—
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timeout.
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Lightning…
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Ambush!
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The blade is sharp,
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but it’s too small to cut through.
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Truly a package opener.
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I hate cucumbers.
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You all should try making
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a box-opening knife with your favorite character.
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I’ll be back with an even more fun video.
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Thank you.
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This was Sanago.
19955
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