Nakabosu-san Level 99, Saikyou no Bukatachi to Tomo ni Nishuume Totsunyuu!

Shijima Cave, jo heroes ke base ke paas sthit pehla dungeon hai, ke middle boss ke roop mein Ichi Monster Nargoa ko niyukt kiya gaya tha. Unconscious monsters hone par dungeon ke kamzor pradarshan ko dekhte hue, Nargoa ne bade badlav shuru kiye. Ek saal baad, dungeon itna kathor ban gaya ki mid-level brave parties bhi use reject karne lage, aur yeh ek legendary labyrinth mein parivartit ho gaya. Apne inhabitants ki raksha ke liye individual heroes ko challenge karne aur Demon King ko harane ke baad, Nargoa kuch aise tarike se ek shataabdi baad is duniya mein punarjanm le leta hai. Is naye yug mein, Shijima Cave aur uske employees se judi ek kahani samne aati hai, jo ab ek prasiddh aur khatarnak labyrinth ka hissa ban chuka hai.