The game's prologue begins with the protagonist (who can be named by the player) enrolling in Kirameki Private High School, which he chose in an attempt to reconnect with his childhood friend, Shiori Fujisaki, whom he has always had a crush on. On his first day of school, he meets Yoshio Saotome, who becomes his best friend, and the most popular guy in school: Rei Ijuin, the snobby grandson of Kirameki's chairman, who is beloved by the girls and hated by the boys. Soon, he also learns about Kirameki High's legend: couples tied under the school's Legendary Tree on the graduation day will be blessed with eternal happiness.