Dōkyūsei (同級生, lit. "Classmates") is an adult-themeddating sim series created by ELF Corporation. The original Dōkyūsei, originally released in 1992 for the NEC PC-9801 microcomputer, is generally considered to be the forerunner of the modern dating sim. It was followed by sequels: Dōkyūsei 2 and Kakyūsei (下級生, meaning Underclassmates), both of which were also very successful. There was a four-episode OVA made from Dōkyūsei, a 12-episode OVA was made from Dōkyūsei 2, and both an OVA and TV series from Kakyūsei. In 2004, ELF released the next in the series of games, Kakyūsei 2, which also received a TV series and OVA adaptation.
A Game Boy Colormahjong game with Dōkyūsei 1 characters called Jankyūsei (雀級生) was also created. The Dōkyūsei 2 expansion disk (Nanpa 2 Special), Dōkyūsei 2 SP, was also made into an OVA, this expansion is also referred to as Sotsugyōsei (卒業生, meaning The Graduate).
Despite its title, most of the girl characters are not classmates of the main character.
