0verflow(オーバーフローObafuro), erroneously Overflow, is a Japanese video game division of Stack Ltd. specializing in the production of mature interactive fiction. The company is best known for its popular game franchise School Days, which has spawned numerous multimedia adaptions and two sequels. Its headquarters are located in the Sugishō Building(杉商ビルSugishō Biru) in Kanda, Chiyoda, Tokyo.