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

Since childhood, Yuuya Tenjou has been subjected to bullying, causing him emotional wounds. Despite living with his beloved grandfather and attending school, he continues to endure the relentless attacks of his tormentors. Eventually, Yuuya takes a long break from school to heal and recover. During his hiatus, Yuuya is occupied with tidying up his grandfather's home when he uncovers an unfamiliar room filled with various artifacts that his grandfather collected during his travels. As he arranges the items, Yuuya stumbles upon a hidden door that piques his curiosity. He unlocks the door, only to be stunned by what lies beyond.