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-
If I let my guard down for even a minute,
 I'll get fat in no time.
إن استهترت في هذا الأمر، فسوف
أسمن خلال فترة قصيرة
Wenn ich nicht aufpasse,
werde ich gleich wieder fett.
Si bajo la guardia, gano peso enseguida.
Si bajo la guardia, gano peso enseguida.
Si je baisse ma garde,
je vais grossir immédiatement.
Non posso abbassare la guardia,
 ingrasso in un batter d'occhio.
Se eu relaxo muito, logo eu engordo.
Если расслаблюсь, тут же поправлюсь.