1: She has absolute no personality whatsoever. She's over-sensitive, selfish, and has no character development.
2: She's the PROTAGONIST. It's impossible to date her.
3: She's non-existent.
Well, the storyline is cliche but adorable, the characters have a personality to adore and even the teacher is surprisingly interesting.
The problem that -only- I see is with the main character. No personality whatsoever, flaws that only exist for plot convenience, annoyingly cliche mentality and overwhelming sensitivity; she cries/tears up at least once every two darn days. Maybe tone down the Mary-Sue-Ness? Even if it's just a joke, it's still pretty annoying.
That all said, the game is surprisingly good. I'm pleasantly surprised; this was unexpected. Great job, honestly.