Just in case the game is not intuitive, here's some walkthrough for the game.

Clock Tower

Interact with clock to went 15 minutes ahead. Enter the door to went 1 hour ahead.

Events sequence : 6.00 east near clock, 9.00 east near clock, 3.30 west near clock, 6.00 west near clock, 3.30 west near clock, 6.00 west near clock.

Music Mansion

When in the piano room, enter "B-A-B" when each of the note being played in the background.

Tell a Story

Any options lead to the ending as long as you tell the ending. Choose "Librarian Girl" in the library to read something in the 3rd section. The other story in the 3rd section haven't written yet. :'