Tenwa Hisho Den Kamiwaza No Yubi Wo Motsu Onna.

Mari, a female pickpocket with exceptional dexterity, lives a solitary life. Meanwhile, Yuji, the leader of the mahjong club "Jyoko-kai," which is on the verge of disbanding, happens to come across Mari pickpocketing in action and sees in her skill that she has the talent to become a world-class mahjong player.