Kamen Rider Gaim

The Brothers' Conclusion! Zangetsu vs. Zangetsu Shin (1x36)

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As Mitsuzane/Zangetsu Shin is about to kill Kouta, Takatora appears and stops him, revealing the two's relationship as brothers to Kouta. Later, the fight of the two brothers begins as Takatora returns as Zangetsu to fight Mitsuzane.