 He reveals to Renya and his friends that the hidden village has secretly gathered supposedly deceased members of fallen noble families and overthrown lords in order to conceal their identities since the remnants of these families could possibly become powerful in the future, regardless of their lack of actual political connections.During the attack, Isshin fights Renya's teacher and survives the explosion from the teacher's suicide attack.When he goes to find C.C., he finds Renya and dies when Renya drains his life away.