Nanako's singing practice is put to an unexpected test when a sudden change in programming for the university's school festival presents an opportunity for her.
That would explain why 
it was listed as a secret.
.سيشرح هذا سبب إبقاء الأمر سرّا
ça passe, comme invités secrets.
Questo spiega perché era stata tenuta segreta.
se dissermos que é uma cantora
desconhecida com uma banda de apoio.
Так можно будет объяснить,
почему гость тайный.