Kangoku Yuusha no Yarinaoshi: Otoshimerareta Saikyou no Yuusha wa 500 Nengo no Sekai wo Jiyuu no Ikiru (Light Novel)

In a world 500 years later, I shall live for my own sake this time. The undying hero, Kogane finally breaks free for captivity after several hundred years. Together with the girl who was the reincarnation of an evil dragon he subjugated in the past, he seeks to retrieve the years he lost, occasionally meeting past allies and occasionally being hunted down. The crime fantasy of the resurrected hero begins here—!