Miyuki Hashimoto
The PC version of the visual novel has two main theme songs, one opening theme and one ending theme. The opening theme, , is sung by Miyuki Hashimoto, written by Aki Hata, composed by Akiko Tomita, and arranged by Junpei Fujita. The ending theme, , is sung by Chiki-chan, written by Hata, and is composed and arranged by Yūichi Nakano. The PS2 version's opening theme is , which is sung and composed by Hashimoto, written by Noboru Yamaguchi, and arranged by Masaki Suzuki. The PC game's original soundtrack called "Gradation!" was released by Lantis on October 31, 2008, containing two discs.