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Okimoto Shun dropped out of college to become a professional mahjong player. He plays in the mahjong parlors of Shinjuku, where he encounters many formidable opponents. When the story kicks off, his primary mahjong parlor has just gone out of business, and he is looking for somewhere else to play. In the mahjong parlors of Shinjuku, Shun will play many games of mahjong with many different people, improving his game through experience!
Miiko is a girl with a problem. She's passed all the tests and become a Mahjong Pro, but she stinks at Mahjong! She was starting to even hate the game, but then she runs into a man who used to be a Top-Tier Mahjong Pro named Namidame in a parlor and asks him to teach her how to play right! The two strike a connection and Namidame vows to help Miiko work her way up to the top leagues.