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In the Nekomonogatari-Black anime, yōtō "Kokoro-Watari" (妖刀「心渡」, sometimes translated as demon sword "Heartspan") is shown with different lengths, but it always appears to be bigger than Araragi. The size changing isn't very noticeable unless you are actively checking, so it could just be due to animator laziness, but the fact that it is longer than Araragi is seems deliberate as it is drawn that way consistently in every scene.

Here is one screenshot of the sword, compared to Araragi. Both red lines are the same length.

Even if he is leaning over in the picture, it's pretty clear that the sword is bigger than he is. It's also clear when he gets cut in half:

However, despite the fact that the sword is taller than he is, it fits into his body. It even fits in Shinobu's body, though of course that could just be one of her abilities. But to the best of my knowledge Araragi should not have any such ability. In addition, the sword is stuck in the ground after his legs disintegrate, which also should not be possible if it was inside of him.

This could very well just be SHAFT following their usual style with the Monogatari novel adaptations, where the visuals aren't meant to be taken literally. Or it could be an indication of another ability of the sword. Is there any evidence that yōtō "Kokoro-Watari" has some ability that would allow it to fit inside Araragi's body (e.g. changing size)?

Madara's Ghost
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Logan M
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  • Just to clarify--you're asking how the Demon Sword Heartspan is able to fit inside Araragi's body? – kuwaly Feb 06 '13 at 00:45
  • @kuwaly Yes, that's right. – Logan M Feb 06 '13 at 00:46
  • +1 Wow, I did not notice this at all. And I watched it literally 2 days ago... – Mysticial Feb 06 '13 at 01:17
  • I don't think "Heartspan" is an accurate translation of "心渡" (Kokorowatari, lit. "Heart Ferry"). So maybe something like "Cross-over-Heart" or "Heart Crosser," since "watari" comes from the verb "wataru; 渡る" (meaning to cross over or to cover). Perhaps it's an allusion to childhood oath "cross your heart and hope to die?" – кяαzєя Feb 06 '13 at 22:55
  • @Krazer [Wikipedia](http://en.wikipedia.org/wiki/List_of_Bakemonogatari_episodes#Nekomonogatari_.28Kuro.29_.282012.29) translates it as Heartspan. I don't know whether or not this is an official translation, but it's how I've seen it written in English before. I agree they don't really mean the same thing. If you can find a better translation feel free to edit it in; for now, I've put the Japanese name in parentheses to avoid confusion (though there is only one sword in Nekomonogatari-Black so there isn't much room for confusion). – Logan M Feb 06 '13 at 23:06
  • @LoganM I think this was decided by the UTW translator/s that subbed the episode. – кяαzєя Feb 07 '13 at 01:48
  • @Krazer While that may be the case, this is the name by which the sword is known in the majority of the English-speaking community, as evidenced by the fact that it was the only English name I could find for it when I was composing the question and looking for the name. Even if it isn't a good translation, we shouldn't go making our own name, as that isn't what people will search for. I'd be fine with changing it if there is an official translation, but barring that I think we should either keep this name or use a romanized version of the Japanese name. – Logan M Feb 07 '13 at 01:56
  • In any case, let's continue this discussion in chat if you want to, because I don't think we should be making decisions like this that might impact other questions here. – Logan M Feb 07 '13 at 01:57
  • Shinobu can change the length of the sword. She can even replicate it as said in the novel and shown in monogatari second season in the other timeline. –  May 16 '14 at 06:22

4 Answers4

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As someone who read Kizumonogatari (translated by Baka-Tsuki, not in original Japanese) I thought that I might shed some light about the sword.

First off, I would like to mention that although Kizumonogatari does have a whole bunch of interesting facts about the series (most of which are based around Shinobu and Koyomi's relationship) there is actually surprisingly little about the sword (I actually found this thread by googleing the sword).

I'll try to refrain from spoiling and just say you learn where the sword is from and how it only cuts Kaiis (or Aberrations/Monsters) but we are not told that it has any other special properties from a sword otherwise, so while mcs may have the correct answer, I believe it actually lies elsewhere.

First off I will answer why the sword is able to fit inside Shinobu. Contradictory to Koyomi, Shinobu doesn't actually stick the sword inside herself. Vampires actually have the ability to materialize objects/possessions at will, and Shinobu "conjures" up the sword each time she wishes to wield it. Koyomi never reached that "power level" so he was never able to materialize anything, but to Kissshot-Acerolaorion-Heartunderblade it was no big deal. As for why she materializes it from her mouth, I have no idea (but hey, it sure looks cool).

For Koyomi, I think you actually answered your own question. Indeed the sword is longer than him, I think in the novel it was said to be around 2 meters (~6.6 feet) long. However as you so keenly noticed, the sword was stuck in the ground. During his conversation with Hanakawa, Koyomi never moved from his original spot and if you notice his standing posture is a little strange (he seems to be focusing all his weight on his left foot). I think this is just because he stuck the sword (through him) straight into the ground and couldn't move from that axis.

This is just what I thought from re-watching the scene and from reading the light novels. I hope you found my information useful.

Delti
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  • This answer is very helpful. I didn't notice that Koyomi doesn't move for that scene. Factoring that in, I think your answer is as good as we're going to get, so I've accepted it. – Logan M Jul 26 '13 at 17:46
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This is just an on-the-spot theory since I haven't read the novels, but 刃渡り means the length of a blade. Notice it shares 刃 with 忍 and 渡 with 心渡, while 心渡 and 忍 share 心, completing the trifecta.

Thus I think it's safe to assume that the length of the 心渡 is a crucial part of its design. (perhaps "heart-length" would be the most appropriate translation)

From this you could derive any number of theories and many of them would be appropriate. The simplest would be that it changes length depending on the will, emotions, or state of mind of the user (all three have close ties to 心).

While Shinobu is heart-under-blade, the sword's true usage might be heart over blade, i.e. mind over matter, controlling it with your will.

Someone who's actually read Kizumonogatari might be able to give a definite answer.

mcs
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  • We were discussing this in chat yesterday. It seems that Kizumonogatari does not explain it, though we do learn some more about the sword. There could still be an explanation in Onimonogatari, which none of us had read. In any case, +1 for an interesting answer, but I'm not going to mark it as accepted unless it's confirmed that either this is the correct explanation or that it isn't explained in the series. – Logan M Feb 07 '13 at 17:05
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    Some translation would be nice (at least the literal meanings of the kanji)... Not all of us know Japanese, thus `but 刃渡り means the length of a blade. Notice it shares 刃 with 忍 and 渡 with 心渡, while 心渡 and 忍 share 心, completing the trifecta.` doesn't look like a strong argument xD – SingerOfTheFall Feb 08 '13 at 07:01
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This post is old but since it hasn't been answered yet: In the novel, Araragi explains that he swallows the sword and stabs it down through one of his legs until it is burried past his throat and all the way through the floor (As a little nod to that, you can notice that though his posture shifts, he never moves one of his feet).

The ability of kokorowatari as explained in the novel is that it can perfectly cut through anything, oddity or object. Oddities are hurt by this cut but physical objects and living thins are so seamlessly cut that they join back together at the incision and receive no damage; so that's why Araragi could easily push through his flesh and the concrete floor.

In the anime it was really only drawn to it's full length as an artistic liberty to be more visually impressive. Heck, for that matter when Shinobu rips out her arm to restore Araragi with her blood, Araragi explains that his bottom half rematerializes but the pants are left behind and they didn't draw him half naked.

Fritfrut
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Spoiler for Kizumonogatari:

In Kizumonogatari, Kissshot explains that the Heartspan is not the original sword, but a copy made of vampire blood (the blood of Kissshot's first servant). That by itself is enough to explain why Shinobu and Araragi, being part vampires, can manipulate it in that way. When the sword enters their bodies, it melts into blood again. The sword is special in this case, not them.

senshin
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Akito
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    I think this explains it for Shinobu, but not Araragi, as he isn't really a vampire after the end of Kizumonogatari. In any case, the accepted answer above by Delti says something similar for Shinobu. – Logan M Aug 17 '13 at 03:46