Hisaki and Yasha are an odd pair of friends: Hisaki is quiet, distant, and possibly keeping secrets from everyone, while Yasha is loud, violent, and in serious need of anger management. As they try to deal with each other, they soon find that creatures are after them for something they know nothing about: a demon supposedly hiding within one of them.
Yasha, still injured and bloodied from her prison cell escape, continues to try to find a way out of the ninja castle. However, there are many soldiers intent on re-capturing her.