Isekai de Cheat Skill o Te ni Shita Ore wa, Genjitsu Sekai o mo Musou Suru: Level Up wa Jinsei o Kaeta

Yûta Tenjo has long been a victim of bullying. He goes to high school while living alone in his late grandfather's house. Despite the violent attacks he endures, he always finds comfort during the long holidays. During this time, while cleaning the house, he also decides to clean the room where his grandfather kept the objects he collected throughout his life. A room Yûta had never entered before. While trying to organize the objects his grandfather collected, he finds a mysterious door that appears to have been cut into the wall. Out of curiosity, he decides to open it and discovers that this door leads him to another world where magic exists.