Sekai Saikyou Inkya, Dungeon Haishin de Oku Bazuru: Haishin Kiriwasure no Sei de, Ukkari Level Counter Stop shiteiru Koto ga Bareteshimatta

Suddenly, dungeons have appeared all over the world in modern Japan. Omomo Rei is a genuine loner in the real world, but in the dungeon, he is the only person in the world who has reached the maximum level. Rei, who has cut off all ties with society and is completely absorbed in the dungeon, one day