Ryoma Terasaka is a student that goes to Kunugigaoka Junior High School and is inside of the End Class, Class 3-E. He and all his other classmates inside Class 3-E are all trained assassins, hired by the government to kill their teacher, Koro-Sensei, who destroyed part of the moon, leaving it a permanent crescent. He usually hangs out with his friends Itona Horibe, Takuya Muramatsu, Kirara Hazama, and Taisei Yoshida, with Kirara being the only female in the group. Ryoma acts tough but he's cool.