School Days (スクールデイズ, Sukūru Deizu?) is an animation adventure game developed by 0verflow and was first released on April 28, 2005. The original version, made for the PC, contains adult content of a sexual nature. An all-ages version was later released on January 17, 2008 for the PlayStation 2.
Similar to traditional visual novels, gameplay in School Days follows a linear plot line where at predetermined times the player is given the choice to interact and choose several options that appear on the screen. It differs from traditional visual novels in that the story is presented in a format that resembles an anime, and is divided into individual episodes and contains an opening sequence and an ending sequence.
The game is known for its "bad" endings, with contents ranging from the murder of the main characters, to graphic depictions of suicide. A spin-off of the game, Summer Days, was released by 0verflow using the same system, but with such contents removed.
School Days has made several transitions into other media, including a twelve-episode anime created by TNK, and two OVAs by the same studio, a manga series, three novels, and a drama CD.