1. when and if you return to the future,go to your room.
2.get on the computer press the file button.
3.there will be a picture and a sheet of music for the piano.
4.(assuming you no the piano keys) go to the past and go to the mansion.
5.go to the piano and play that song.
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Go to your apartment in the future and then click on your computer in your files you see a music sheet, play the music sheet on the white piano at the past. Or you can type the cheat to unlock her...... ^ To above answer. But how do you play the music? I tried looking it up but I honnestly can't figure out how to play it.
In Chrono day sim after about the fifth day Teddy comes and takes you back with a working time jumper. Which he gives to you.
Tokens, from Gentleman Goods. There's probably another gift you can give to him, but here's one.