Pizzicato Polka -Suisei Gen'ya-

The game takes place in a town where a series of homicides have taken place. You play as main character Tatsuya Tsuzumi who has come to the town as an exchange student in order to search for his friend, whose whereabouts are unknown. While in town, you get close to a group of girls and begin to learn the true nature of the case plaguing the town.

(from GameSpy)