My Level Up Dungeon App

Ordinary high school student, Shion Reita (Tama Da Shion). One day, an app called "Dungeon Survive" is installed on his smartphone. Benefiting from this app, he gains skills. Eager to explore, he decides to challenge the dungeon and level up. However, what he doesn't yet know is the fact that among the numerous players, he is the only one capable of leveling up