On a crowded morning train, Saito Kujou worked up the courage to help a handsome high school boy named Rei Hoshina, who was being assaulted by a violent man. Even though he was scared, his kind nature pushed him to step in.
After that incident, a secretly recorded video of the scene went viral, turning Saito into something of a school celebrity. Things started to look up—he even began growing closer to his beautiful seatmate and classmate, Rinna Nishino, the most popular girl at school.
At the same time, he became friends with Rei, the boy he rescued on the train, and they started hanging out.
But then… everything took an unexpected turn.
