Mito Kōmon is a Japanese jidaigeki or period drama that has been on prime-time television since 1969. The title character is the historic Tokugawa Mitsukuni, former vice-shogun and retired second daimyo of the Mito Domain. In the guise of Mitsuemon, a retired crêpe merchant from Echigo, he roams the realm with two samurai retainers, fun-loving Sasaki Sukesaburō and studious Atsumi Kakunoshin. Episodes typically conclude with a brawl in which the unarmed, disguised protagonists better a crowd of samurai and gangsters, culminating with the presentation of the inrō that reveals the hero's identity.
Not a lot of people know that one of the most talented and ruthless Mahjong players in the city is a young high school boy. Kei is a teenager of few words, but his observation skills, unwavering will and experience in the game allows him to survive in a world full of powerful, rich and dangerous characters. Kei is currently hiding a girl named Amina who has entered the country illegally and protecting her from being deported. He spends his days sleeping through class and his nights playing high stakes Mahjong, waiting for when a worthy opponent arrives.