[It’s a familiar dungeon.]<br />Inside a medium-boss room of an RPG game that he played again and again until he can get there with his eyes closed.<br /><br />Waiting for a hero, a demon who exists only to be defeated, got his former life memory revived.<br /><br />Knowing that, in his previous life, he was a nothing-special college student-<br /><br />Continuing to stay as a to-be-defeated mid-boss is a no.<br /><br />The determined him, decided to defeat the boss and escape the dungeon.