>>21073 I think you're thinking of Mudazumo Naki Kaikaku. It was a pretty fun manga. There's even a new version starring le orange man but I haven't read it yet. >>21075 If you like weebshit I'd unironicall recommend reading Akagi; a manga in which some edgy guy plays a 20 year long game of mahjong against some old dude (it actually lasted that long irl, pic related) if not then I guess just learn the rules from a wiki or something. For actually playing the game go to tenhou.net/3/, there's even a browser addon for Chrome and Firefox to translate the site into English: