The Demon God of Oeyama

A familiar dungeon exists, holding a medium-boss room that can be navigated even with eyes closed, awaiting the arrival of a hero. Within this space, a demon who exists solely to be defeated has his past life memories suddenly revived. Recognizing his former life as a mediocre college student, he finds it unbearable to continue existing as a mid-boss meant to be defeated. Driven by determination, he sets out to conquer the final boss and escape the dungeon. His quest yields the doping item "Pearl Piece," and he decides to combine this mission with traveling the world of his favorite RPG game. As he journeys, he becomes aware of his reputation growing, and legend has it that he will one day become the Demon God of Oeyama.