TOHAI - URA RATE MAHJONG TOHAI ROKU

Money, women, organs. Kei, a high school boy, frequents the underground mahjong parlor teeming with desires, earning him the moniker 'K of Ice' in the underworld due to his cold-hearted strategy and stylish gameplay. Rumors also circulate that he keeps a girl at his home. (Source: Pony Canyon) — Description from AniList community (anilist.co).