Muhyo and Roji visit the home of Shiratori Aya, a client who says a black shadow has been playing her piano at 2:00 AM every night. Muhyo concludes that the shadow is a vengeful spirit born from countless people who envy Aya's talent, but in fact... Later, a package arrives at the bureau for Roji, containing a "magic-sealing pen" and an invitation to take an exam for a promotion to first-class secretary. Then Nana enters with a photo she took of a spirit on a pedestrian bridge...
In other words, you mean that 
piano is your babysitter?
أي أنّ ذاك البيانو هو جليسك؟
Der Flügel ist also so was
wie dein Kindermädchen?
¿Dices que ese piano es tu niñera?
Bref, on peut dire
que ce piano te sert de nounou.
In altre parole,
quel pianoforte ti fa da babysitter?
Ou seja, quer dizer que
o piano é a sua babá?
Получается, это пианино
тебе вроде вместо сиделки?