School Days (スクールデイズ, Sukuru Deizu?) is a Japanese adult visual novel developed by 0verflow and published by Stack, and was originally released for the PC on April 28, 2005. It was subsequently released as a DVD TV game by Stack, followed by an all-ages port titled School Days L×H published by Interchannel for the PlayStation 2, in both limited and regular editions, on January 17, 2008. School Days has since then received a spin-off title, Summer Days, and has made several transitions to other media. including a twelve-episode television and two OVA anime by TNK, a two-volume manga by Homare Sakazuki, six novels and a radio drama series.

Source: Wikipedia