The Pacific Chrysalis was Mithril's first true victory over Amalgam, but their success has only led to escalation. Between growing suspicion at school and cryptic warnings from Tessa's brother that everything is about to change, Sousuke begins to realize that his peaceful life in Tokyo might not last much longer. Before he can even prepare, though, Sousuke finds himself running a gauntlet beyond anything he could have imagined. He'll have to fight not just for his own life, but for the life of everyone he knows!

As a member of a covert military operation, teen Sousuke Sagara attends high school while serving as the protector to high school student Kaname Chidori who is targeted by various organizations.