Win at Mahjong, Win a Night With Her (夜の賭け麻雀 勝てばあの娘と一晩中)

The sex-and-gambling fiend Rei works at a certain night-time mahjong club.
You’ve got to pay to play with her, but if you win, you’ll hit the…
mahjong version of a jackpot. (Is that still a jackpot?) Anyway, she’ll fuck you.