Hinoshita Kaho, who enrolled in Hasunosora Girls Academy (commonly known as Hasunosora) with high hopes of "blooming" in her high school life, helps Murano Sayaka, who is enthusiastic about "changing herself" from high school, when she slips on the stairs at Kanazawa Station on her first day of school. By coincidence, the two are classmates at the same school! Kaho and Sayaka, who have become friends, witnessed performances by Otomune Kozue and Yuugiri Tsuzuri respectively! While still excited, she is invited to join the Hasunosora Girls Academy School Idol Club --!?