I Got a Cheat Skill in Another World and Became Unrivaled in The Real World, Too

Synopsis

Tenjou Yuuya has been a bullied boy in the past. He lives in the home of his beloved grandfather while he goes to school. As usual, he receives harsh bullying, and he takes an extended absence from school to have some time to heal his wounds. While in this long time of absence, he takes the opportunity to clean his grandfather’s house and goes to a room he never went to before, where his grandfather keeps many different objects that he gathered from his travels around the world. While he was arranging the objects, he found a door, not on a wall among the objects. Out of curiosity, he opens this door, and what he finds on the other side is…