The town of Ootsuka, home to Shino Inuzuka, Sousuke Inukawa, and Hamaji, was set on fire under the mistaken belief that a virus had been eliminated. A weird guy brandishing a sword approached the three, who were now engulfed by flames and on the edge of death. He informs them that if they want to survive, they must make a choice. For these kids, that night altered everything. Five years later, the family of three now resides in a neighbouring village, under the careful eye of the little Imperial Church. Everything is good until the Church tries to retrieve Murasame's demonic sword. To do this, they abduct Hamaji in order to entice Shino, who is now a bearer of Murasame's soul, and Sousuke, who is now a bearer of Murasame's soul.