Season 1

Young Shinoha Tanaka, who has lost the ability to laugh, meets Kiwami Kimura, an office worker who shares his love of anime. The two hit it off, but it turns out they are actually members of rival forces that have been killing each other since the Edo period - ninja and gokudo! "If you misbehave in the underworld, the ninja come a-calling." Ninja and gokudo - who will survive and who will perish?

Kaiza Akiba of the Eight Imperial Ninja's arrival cuts the gokudo's meeting to plan the ninja's annihilation short. Kaiza's Blade of Darkness instantly decapitates numerous gokudo, bathing the room in crimson. However, Kiwami maintains his calm demeanor, which riles up the remaining gokudo. As these two formidable warriors go in for the kill, their thoughts are somewhere else... with Shinoha.

Nodoka Matsumoto of the Eight Imperial Ninja and Kousei Yuzawa of the Eight Gokudo of Destruction are locked in a deadly battle in Kabuchika, once an underground Kabukicho club. Who will survive the clash?! Rushing to aid Nodoka, Shinoha encounters young gokudo member Keisuke. Keisuke has never killed before, and Shinoha intends to spare him, but Keisuke's resolve forces Shinoha to act.

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