Banassar was summoned to the magical kingdom of Kulerod in a different world as a hero candidate. Since his ability was only equivalent to that of an ordinary citizen, he was branded as a disqualified hero. As a result, a mistake caused Banassar's repatriation process to fail, making him unable to return to his original world──! ? With no other choice, Banassar had to settle in the different world. He defeated slimes in the forest and was able to level up. At this moment──"What's going on...!? What is this ∞?" After Banassar reached level 2, all his ability values became "∞"──He learned all the skills and magic, and all his ability values became super strong! Even in this special situation, Banassar mistakenly thought that this was very common in the different world. In order to hide his identity, he took the pseudonym of Ferio. In order to get a job, Ferio went to the Adventurer's Guild, where he had a fateful encounter with Fenris, who was born in the demon clan...! ?