Dungeon Seeker

Junpei Takeda is a high school student who is close friends with Noriko Tatsumiya and often targeted by the bully Kido Shouta. During an incident involving bullying, Junpei and others are unexpectedly transported to another world by a divine force. Believing they have been chosen as Heroes with special advantages, Junpei soon discovers his abilities are weaker than those of a typical farmer. Betrayed by someone he trusted, he enters a deadly labyrinth and begins a journey driven by a desire for revenge.