Season 0 of Taimanin Asagi premiered on 2009-05-01.

Igawa Asagi is a veteran Shinobi. After defeating her archenemy a long time ago, she thought she could finally settle down. Yet, her archenemy was revived from death through a pact made with the head demon in the city and swearing to take revenge on her by hurting those who are close to her. Her boyfriend, her sister (also a Shinobi) and she herself are part of the act being abused emotionally and... sexually...

One year has passed since the Chaos Arena was destroyed, Asagi and Sakura were presently on an abandoned street on a man-made island that floated on top of Tokyo Bay. It was an enormous box-shaped island built by the government and referred to as "Tokyo Kingdom." There was hope that it would become a second city center floating at sea, but it had failed to attract businesses. The only way of getting to and from the island was through Honshu Island over the 10 kilometer Tokyo Kingdom bridge. Unfortunately, this narrow route was the means in which the inhabitants of hell found their way onto the island, luring anarchists, criminals, and even illegal immigrants there, transforming the streets of the sea bound city into a world-renowned haven for danger. However abandoned the streets were, order did exist in such a place despite it being a breeding place of crime.

Determined to save their friend Kousuke, veteran ninjas Asagi and Sakura are back with a vengeance! Only to get raped again...