Katsuragi Daichi endures relentless persecution before being thrust into a parallel realm alongside his entire class. Desperate to forge a hero's path, he discovers his weakness makes him expendable—discarded within a Monster House as the group's sacrificial pawn. Death should have claimed him. Instead, he awakened untouched. The gift bestowed upon him was [Revenge of the Grudgebearer], a rare ability that resurrects him with each fatal blow and grants exponential power with every rebirth. Armed with this formidable power, Daichi embarks on a merciless quest for vengeance.