Chi-Toitsu

Chi-Toitsu: Ichiman Satte Mata Ichiman is a classic Japanese mahjong arcade game released in February 1988 by the developer Yuga.

The game centers around traditional Japanese Riichi Mahjong, where you play matches against various anime-styled schoolgirl characters. It runs on a classic Zilog Z80 CPU and was built for standard tabletop arcade cabinets utilizing a specialized mahjong keyboard layout rather than a typical joystick setup.