Kami wa Game ni Ueteiru.

Fay loves to play games. He learned how to play by a beautiful woman, Onee-chan, who had a long, red hair. In the world he is living, Gods - spirits, demons, angels, dragons - are bored and they make humans play games with them. Human players are called Apostles... and if they win ten times, Gods will grant any wish for them.

Fay, winning three games a row even though he is a rookie, is said to be the best player among all Apostles. He just wishes to meet Onee-chan again if he wins ten times. But he never expected to be paired with a red-haired girl, looks just like Onee-chan!, who is a former God just awoke from a long sleep.