The Immortal Dungeon of a Salaryman

A salaryman, Yamagishi Am綱, suddenly finds himself in an unknown cave with a giant black tiger. He struggles desperately in this absurd situation, facing death and rebirth repeatedly. What choices will he make? Will he escape this cycle of despair? He fights with all his might to overcome the unreasonable circumstances. Having overcome hardships and gained new strength, he challenges himself.