Touhai: Ura Rate Mahjong Touhai Roku

Many people do not know that one of the most talented and ruthless players in the city is a young high school boy. Kai is a teenager of some words, but her observation skills, unwavering desire in sports and experience allows her to survive in a world filled with powerful, prosperous and dangerous characters. Kai is currently hiding a girl named Amina, who has illegally entered the country and has saved her from being deported. She spends her days sleeping through the classroom and plays her nights high stakes when a worthy rival is waiting.