One stormy night, when Nangō is playing a game of Mahjong with the local yakuza. Soon, he finds himself on a losing streak. If Nangō loses, he will have to pay with his life. Suddenly, a young teenaged boy, Shigeru Akagi, barges in, drenched from the rain. After watching a couple of games, he offers to replace the struggling Nangō. At that moment, a new legend is born.