Usato, an ordinary high school student, is suddenly summoned to another world along with Suzune, the student council president, and Kazuki, the vice president and classmate. The three were asked to save the Ringle Kingdom as heroes, but in reality, the only summoned heroes were Suzune and Kazuki, and Usato was just dragged into it! However, the situation changes when it is discovered that Usato has an aptitude for healing magic. Then Rose, who introduces herself as the leader of the rescue squad, appears.
