Shuhei Oda was a high school boy who was at the bottom of the school caste. One day, Shuhei is suddenly summoned to another world, “Ofermaus”, and together with the priestess who summoned him, Liena, he spends five years defeating the Demon King and saving the world. Then he returns to Japan again. After realizing the value of peace during the battle with the demon king, Shuhei vows to restart his school life to lead a fulfilling high school life instead of being a loner like before. He entered the class energetically first thing in the morning and chatted briskly. He ran for class president position “He looks like a different person.” “Is It a Late High School debut?”. Shuhei was gossiped about behind his back. However, the steel mentality that he had cultivated through his battle with the demon king was not shaken in the slightest by such gossip. On his way home, Shuhei manages to save the school’s idol, Hasumi Kana, who was being pestered by delinquents, and becomes friends with Kana. Shuhei’s physical abilities and heroic skills, which he had developed over the years, allowed him to play an active role in class, and he quickly became the central figure of the class.