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.
Kakon, Haru, and Hisaki charge through the various guards protecting the ninja castle. But there is one man who stands between them and finding Touya, as well as Yasha.