This sound is from Maiden's rest: Otome wa Boku ni Koishiteru Original Soundtrack maiden's rest『処女はお姉さまに恋してる』オリジナルサウンドトラック - Video Game Music

Video game music from maiden's rest: Otome wa Boku ni Koishiteru Original Soundtrack maiden's rest『処女はお姉さまに恋してる』オリジナルサウンドトラック for Windows. Published by Digiturbo (2005). Uploaded by Underv3rs.