In the WN, Mao Mao's mum is dead. This avoids the icky question as to why Rakan never redeemed her if she became syphilitic. Instead, he only comes to the brothel to pick up Mao Mao as his daughter while the Madam turns him away every time. It's still not 100% confirmed the bedridden women is...
I never thought I'd see mahjong in this manga...
For those curious, the casino girls get 4 Concealed Triplets and 13 Orphans, two of the highest scoring hands in mahjong. Looking at it again, it might even be an All Green, 4 Concealed Triplets.
If you're in riichi, you're in furiten if you pass a ron until the end of the round.
If you're not in riichi, you're in furiten only until it's your turn again. You don't need to change your hand either.
I remember the series making a big point about how busty Nodoka was but now it seems her chest size is downright modest compared to the other characters we've since been introduced to.
"Elder sister of the human king"? I would assume that she's the princess's aunt on her mother's side. Or does he mean sister-in-law? Or is the family tree more like a family dreamcatcher?