Mahjong Sisters
Gameplay. "Mahjong Sisters" is a tile-based japanese mahjong eroge game where players compete against three sisters with the main objective of winning the matches by getting the girls undressed. As far as gameplay goes, the game plays like other mahjong titles released at the time, as the goal of players is to take points from other players by drawing and discarding tiles until a winning hand is made. The player can choose between one of the three selectable girls at the beginning to start a match: Sayuri, Yukari and Megumi. During gameplay, players needs to claim mahjongs  in order to get the girls with taking off their clothes. Failing to do so results in the girls putting a piece of their clothing back on. By meeting certain conditions such as obtaining a tenpai, the players also have the option of stripping the girls. The game is over once the players has zero points or less in their favor, unless more credits are inserted into the arcade machine to continue playing. Development and release. "Mahjong Sisters" was released only in arcades across Japan by Toaplan in 1986. According to former Toaplan composer Tatsuya Uemura in a 2009 interview  with Japanese publication "Floor 25", the code was based on the company's previous mahjong releases; "Jongō" and "Jongkyō". Osamu Ōta was responsible for the audio design, although he is not credited as such in the title. On 29 August 2018, an album containing its audio, as well as from other Toaplan titles was published exclusively in Japan by City Connection under their Clarice Disk label. Legacy. In more recent years, the rights to "Mahjong Sisters" and many other IPs from Toaplan are now owned by Tatsujin, a company named after "Truxton"'s Japanese title that was founded in 2017  by former Toaplan employee Masahiro Yuge, who are now affiliated with arcade manufacturer exA-Arcadia. On 7 December 2019, M2 announced they acquired the license to nearly all titles developed by Toaplan for re-release on modern platforms in the future, however "Mahjong Sisters" was excluded for multiple reasons.