Mahjong Pretty Girls Battle : School Girls Edition had Steam trading card support added on June 22, 2015. There are 9 cards in the series, and you'll receive 5 cards at random for purchasing and playing the game.
Trading Cards
Aoba Soma
Nao Yada
Hatsune Shiraishi
Rio Nanjo
Yurika Aoshima
Saki Hayasaka
Ouka Kushizae
Kotomi Mizusawa
Misa Yuuki
Foil Cards
Aoba Soma
Nao Yada
Hatsune Shiraishi
Rio Nanjo
Yurika Aoshima
Saki Hayasaka
Ouka Kushizae
Kotomi Mizusawa
Misa Yuuki
Badges
Booster Pack
Emoticons
Profile Backgrounds