Salaryman no Fushigi na Dungeon

Yamagishi Amizuna, a salaryman, finds himself in an unfamiliar cave with a giant black tiger appearing before him. After being attacked and seemingly dying, he wakes up in the same location. Confused and without a clear objective, he navigates an illogical scenario where he must use his body to gain levels and overcome dungeon challenges. Each time he dies, he is revived at the starting point, gradually learning from his mistakes and acquiring abilities to progress. As he continues to face the same threats repeatedly, he gathers more information and skills to advance through the stages. His only goal is to escape this bizarre game by improving his strength and surviving the deadly encounters.