Karasuma Waka is a 13 years old girl who adores Go. She received this passion for the game from her grand father, a professional Go player. She loves Go so much that she even forgets to get her hair cut! However, her mother doesn't allow her to play Go, since she has a bad image of her father, who once left to play a game while his wife was dying.
One day, Waka sees a game of a very strong professional player called Sagisaka Souji. Impressed by his style, she decides to become pro despite the objection of her mother. The young girl proposes her a bet: if she wins the next tournament, her mother will allow her to become pro, otherwise she will abandon her dream.