After Japan opened its borders, the entire country quickly became a hot spot for crime and violence. Jin Narumi, a shinobi who isn’t pleased with the changes that have overtaken his homeland, vows to protect those who can’t protect themselves. On one of his usual outings, he runs into a young boy named En who is being chased by a known gang of criminals. But there is more to En than meets the eye, as under his simple appearance lies power…the power of a shinobi!
The Narumi-kai has been hired to protect an up-and-coming supermodel, Maki Mizuno, but their mission puts them in the sights of the elite Seigan squad and their sadistic boss, Hyosui Nagumo. When Hyosui’s casual brutality ignites Jin’s fury, the two squads go to war in a clash that throws the entire underworld into turmoil.
To complete the final mission in the Shinobi Union ranking trials, Jin’s squad enters the Domain of Death, a lawless slum ruled by a religious terrorist cult. The squad must break through every despicable attempt to stop them as they confront the evil lurking in the heart of the forsaken district.