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-
today we are celebrating this 
great day of our graduation.
نحن نحتفل اليوم بيوم تخرّجنا العظيم هذا
Heute feiern wir den großen Tag
unseres Abschlusses.
hoy celebramos el gran día
de nuestra graduación.
hoy celebramos el gran día
de nuestra graduación.
nous sommes réunis pour célébrer
cette cérémonie pleine d’espoir.
oggi celebriamo il giorno felice 
del nostro diploma.
hoje estamos comemorando
nossa formatura.
сегодня мы празднуем 
великий день нашего выпуска.