Nagi-san is a renowned warrior and goblin slayer. One day he receives a mission to clear out a strange cave, where according to rumors the strongest goblins dwell. Nagi simply couldn't refuse such an exciting adventure. However, upon entering the cave, he was attacked by a whole army of goblins, which even such a renowned warrior could never have handled. It was a trap... the goblins decided to take revenge on Nagi and arranged a truly terrible punishment for him...