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-
A Johari Window always 
has the hidden window,
،لدى نافذة جوهاري النافذة الخفية دوماً
Im Johari-Fenster gibt es
das Fenster Geheimnis.
Una Ventana de Johari
siempre tiene una ventana oculta,
Una Ventana de Johari
siempre tiene una ventana oculta,
Il y a une zone cachée
dans la fenêtre de Johari,
C'è sempre il quadrante della facciata
nello Schema di Johari,
A "Janela de Johari" diz que
sempre há uma janela secreta
Окно Джохари включает 
в себя спрятанную зону.