Some TMNT stuff really isn't for little kids.

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The vault of Takeshi Tatsuo is a secret cave located in the forest wilderness of the island of Hokkaidō, now part of Japan. The Kira no Ken, a supernatural sword associated with the Dragon Warrior, was stored in the vault. To guard it, Kitsune transformed Ocho into a yōkai and bound her as the sword's protector.

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