"Dungeon ni Hisomu Yandere na Kanojo ni Ore wa Nando mo Korosareru" is a fantasy story about Kiska, a boy who is mistreated by the villagers. He manages to survive thanks to his childhood friend Namia, who was the only one by his side. One day, Namia is murdered by three men, and Kiska is accused of the crime and banished to an inescapable class S dungeon.