Yakushiji Shion is the eldest son from the clan that punishes bad people. But after he assassinated Empire's shadow Kurobe Akiyoushi, it is regarded as a rebellion against the Empire. He gathers the clan and moves towards the North. Every day they are attacked by pursuers. At the same time he is chased by the girl Hiramatsu Yae who fell in love with Shion.

[From vndbreview]