Shin Usagi Yasei No Touhai

Original title: 真・兎 野生の闘牌

Shun Takeda is a high school student who gets bullied. He is forced to play Ikasama Mahjong. While playing Ikasama Mahjong, he notices a bad hand for himself and runs away. Ai Yamaguchi realizes Shun Takeda's special ability. She tries to take him into the gambling group ZOO.