My Yandere Girlfriend Hiding in the Dungeon Kills Me Over and Over Again

Accused of a crime he didn't commit, Kiska is banished to the deepest reaches of a high-level dungeon with no hope of escape. But when he finds himself on the brink of despair, mere moments away from death at a monster's hands, he's given the chance to turn things around—in the form of the skill “Save & Reset!” (Source: Yen Press)