“It’s always safer not to get involved with anyone.” Minato Okabe, who carries deep trauma from his past, has lived his life by building walls between himself and others. One day, he and his classmates are summoned to another world to become “heroes who will defeat the demons.” While everyone else receives powerful skills, Minato is branded useless, cast out of the class, and thrown alone into a deadly dungeon crawling with monsters. Surrounded by enemies and supposedly “skill-less,” he discovers the true nature of his power: Barrier. From that moment, everything changes. This is the story of a boy who makes all the so‑called heroes his enemies and, armed with overwhelming barrier powers, begins a path of rebellion and revenge—while slowly breaking down the emotional “walls” between himself and others.