Dungeon ni Hisomu Yandere na Kanojo ni Ore wa Nandomo Korosareru

Kiska, a boy who was mistreated by the villagers, was able to get by thanks to his childhood friend, Namia, who was the only one who stood by him. One day, Namia is found murdered in the village. Kiska is framed for the murder by the other villagers, and banished to an inescapable S-class dungeon...?