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. ~~ Based on the manga "Usagi Yasei no Tohai" by Makoto Ito