5 Jikanme no Venus

Shimeji attends the Touyama High School. She has a best friend there, is successful in studies, and also has a part-time job as a waitress. Yet she is not happy. One day, her friends find her on the floor, unconscious. They bring her to the young school doctor, who also happens to be the protagonist of this game. The hero is impressed by Shimeji's beauty, but he is also determined to find the cause of her depression. Piece by piece he uncovers the truth about Shimeji's life...

[from MobyGames]