Not many people know that one of the most talented and cruel mahjong players in this city is a high school kid. Kei is a teenager who does not talk much, but his observation skills, strong determination, and his experience in the game allows him to survive in a world full of strong, rich and dangerous characters. Kei is currently hiding a girl named Amina who has entered the country illegally and protects her from deportation. He spent his days sleeping during class and at night playing mahjong with high bets, waiting when the commensurate opponent came.