A dazzling smile that sparkles too brightly, a singing voice that resonates boldly in a spacious venue, and the heroic figure racing through a sea of colorful penlights—my beloved idol is just too precious!! In spring, as she enters high school, Manaka Sakiko is a huge fan of Chihiro-chan from the idol group "Haruiro Sunshine." She hopes to make friends who are also "Harushan" fans and go to live concerts together! With these sweet expectations, she welcomes her first day of high school. To her surprise, sitting right next to her in class is none other than her beloved Chihiro-chan!? Having her favorite idol in the same school life is just too precious; she can hardly focus on her classes!!