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.
The group takes on the archer demon, but Hisaki and Kakon can't do much but defend themselves. It's up to Haru, a fellow archer, to take her out, but the demon guard isn't going to make it easy.