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-
So just as every dream must end,
 no matter how long...
لذا مثل كلّ حلم لا بد أن 
...ينتهي مهما طال
Egal wie lange ein Traum währt,
irgendwann muss auch er enden.
Así que, como cualquier sueño,
debe acabar por largo que sea…
Así que, como cualquier sueño,
debe acabar por largo que sea…
Comme n’importe quel rêve,
aussi long soit-il,
Quindi, proprio come i sogni, 
che per quanto lunghi devono terminare...
Então, assim como todo sonho,
mesmo que longo, tem o seu fim...
Поэтому, как и любой сон, даже самый 
долгий, что однажды заканчивается...