Mahjong Sisters is a 1986 eroge mahjong arcade video game developed and published exclusively in Japan by Toaplan. In the game, the players face off against a group of three sisters in a series of mahjong matches. As of 2019, the rights to the title is owned by Tatsujin, a company founded in 2017 by former Toaplan member Masahiro Yuge and now-affiliate of Japanese arcade manufacturer exA-Arcadia alongside many other Toaplan IPs.