Arata was dumped by Kotoko, whom he had been dating for two years because she found another man.

Arata, Kotoko, her new boyfriend Atsushi, and a group of two high school boys and four girls are summoned to another world as heroes.

Under the guidance of the country, among the heroes diligently leveling up, Arata becomes self-destructive and selfishly learns the skills he likes.

Arata, not wanting to be near Kotoko and Atsushi, begins to act alone.

Although Arata tends to be lonely, he grows with the support of many people.