Dungeon Seeker

A high school student named Junpei Takeda is randomly summoned to another world by a deity, along with a delinquent and his childhood friend. Believing they have been chosen as heroes, they discover Junpei's status is lower than that of a typical villager. He is then abandoned in a deadly labyrinth with no chance of survival by the others. Facing certain death, Junpei devises a strategy to turn his situation around. He begins navigating the dungeon and seeking retribution against those who betrayed him.