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-
aspects of the self that you 
know but others don't.
سمات الذات التي تعرفها لكن
لا يعرفها الآخرون
Etwas, was man selbst weiß,
aber andere nicht wissen.
aspectos de uno mismo que conoces,
pero otros no.
aspectos de uno mismo que conoces,
pero otros no.
elle englobe ce que l’on sait
aspetti del sé che tu conosci e gli altri no.
com aspectos que você
conhece, mas os demais não.
Аспекты личности, о которых 
знаешь ты, но не знают другие.