Gabimaru, a ninja member of a clan of assassins, is sentenced to death. He claims to have nothing to tie him to life, yet no method of execution manages to end his life. His meeting with Sagiri Yamada Asaemon, who seems to be investigating him, will change everything.

The condemned criminals are gathered on the beach to prepare for the expedition to Shinsenkyo, but first, they must reduce their numbers.

Gabimaru, Sagiri, and the others arrive on Shinsenkyo, and their battle for survival begins.