KimiKiss

KimiKiss (キミキス, KimiKisu?, lit. "Your Kiss") is a dating simulation game for the PlayStation 2. Released by Enterbrain in 2006, KimiKiss has become a media franchise, including manga, light novel, and has been made into an anime as of 2007-2008.

Plot
Kouichi Aihara is a high school student who just came back from summer vacation. He has never been kissed and after returning to school he decides to develop a romantic relationship with a certain girl during 30 days.