How do you unlock Bianca from Chrono Days Sim Date?

Answer 1

In your computer, open your documents. There's sheet music there, you just have to go to the Hayes mansion and play it on the piano there.

For those musically illiterate, the sheet goes:

G B flat A E G sharp F G D sharp D B flat.

Or, on the keyboard, first press the third from the top, then the first "black key" (I guess it's the white key here, the small one on the top), then the second from top, the the third from botton, then the black third black one down, then the fourth one up, the big key fifth up, then the second black key up from the botton, then the key directly behind that (the lower wider one) then the first black key again.