Kouta, 17 years old, is a second-year high school student. His days are unremarkable and average when Kouta meets Yuu, Shunsuke, Ryo, and Seiichiro, who are fellow students attending Hijirikawa High School. In an instant, Kouta's average life begins to be awash with sparkling light. A tale of a sparkling youth and his encounter with the Sanrio Boys begins.