Hasegawa Kouta, 17 years old, second year of high school. Kouta, who lives an extremely ordinary life, meets Mizuno Yu, Yoshino Shunsuke, Nishimiya Ryo, and Minamoto Seiichiro, who are also attending Seikawa High School. At the same time, his ordinary daily life begins to be embellished with shining lights. Such encounters between Sanrio boys and shining youth stories. Our story is about to begin.