Saitama is a hero who only became a hero for fun. After three years of “special” training, though, he’s become so strong that he’s practically invincible. In fact, he’s too…

On August 16, midway through a seemingly endless summer vacation, middle school third-year student Nagara, the mysterious transfer student Nozomi, and classmates such as Mizuho and Asakaze, are suddenly transported…