Yuuya Tenjou has been subjected to bullying since childhood and resides with his cherished grandfather while attending school. Despite receiving harsh treatment at school, he continues to attend classes as usual. After taking an extended break from school to heal from his wounds, Yuuya takes advantage of this time off to clean his grandfather's home and explore a room that he had never previously entered. In the process, he discovers a door among the objects in the room that was not on any wall. Curiosity piqued, Yuuya opens the door and finds something entirely unexpected on the other side.
Isekai de Cheat Skill wo Te ni Shita Ore wa, Genjitsu Sekai wo mo Musou Suru: Level Up wa Jinsei wo Kaeta has been published in English as I Got a Cheat Skill in Another World and Became Unrivaled in The Real World, Too by Yen Press since May 24, 2022.