Shinobu's katana
The katana Shinobu uses is called a Nichirin sword, and when it was first made, the chief of the village of Forge Knife was asked to make it for Shinobu, as ordinary swordsmiths were not capable of or experienced in making this type of weapon.
This Nichirin sword has a very special appearance, similar to a thin sword, but more like an inverted handkerchief, with a long, short, and serrated shape, and when viewed from the front, the tsuba looks like a butterfly with its wings spread out.
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