Bishoujo Janshi Pretty Sailor 18-kin

Bishoujo Janshi Pretty Sailor 18-kin is an adult-oriented, single-player arcade mahjong video game developed and published by Sphinx in August 1994. The title roughly translates to "Pretty Mahjong Warrior Pretty Sailor". The term "18-kin" indicates an 18+ age restriction due to its adult nature. The game is a direct, unofficial knock-off of the highly popular anime and manga franchise Bishoujo Senshi Sailor Moon.

The game features computer-controlled opponents dressed as characters heavily inspired by the Sailor Scouts (Sailor Senshi). Players engage in standard Japanese mahjong matches against these characters. True to the "strip mahjong" (dappan mahjong) arcade subgenre popular in Japan during the 1990s, defeating an opponent rewards the player with mature fanservice scenes where the defeated character strips.