Shikishima Ritsu was living a fulfilling high school life.
Then one day, when Ritsu heard the new song from popular idol, μ, he noticed a cry for help hidding within the song.
Ritsu tried to confirm it with his friends, but none of them would respond to his questions, and they even acted off.
The suspicious incongruities continued piling up until the new year's entrance ceremonies. Yet the new students entering the school were-
Miyabi Municipal Kishimai High School
ثانوية كيشيماي التابعة لبلدية ميابي
Miyabi, städtische Oberschule Kishimai
Preparatoria Kishimai de Miyabi
Instituto Kishimai de Miyabi
LYCÉE PUBLIC KISHIMAI DE MIYABI
Scuola Superiore Kishimai del Municipio di Miyabi
Colégio Kishima do Município de Miyabi
Муниципальная старшая школа 
Мияби Кисимаи