One day, Riku finds a mysterious message on her table from a boy with the initials Y. N., stating that he likes her. Riku's hoping Y. N. is the star of the school, Nakao Yoshiki-kun, but could he be interested in a girl like her? She wants to ask Nakao-kun if he was really the one who wrote the message, but there's this guy who keeps trying to get in her way...