Kamen Rider Hibiki

The Armed Blade (1x33)

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After losing the Ongekizofukuken Armed Saber to the Super Douji and Hime, Hibiki and Todoroki lose the ability to transform. They find out that they will regain the ability to transform in one month, but that is too long with a Kamaitachi running amok. Kogure suggests that the two Oni undergo a special training, under his guidance, to regain their powers.