Ten years ago, the Kitagawa yakuza clan attacked the Muto yakuza clan at Muto's own home, only to have Muto's wife fight back. This unexpectedly left the Kitagawa clan in shambles, with their top hitman Ikegmai wounded and Muto's wife in prison. Despite the carnage, the most unfortunate fallout from this attack is when Muto's beloved daughter, Mitsuko, has her adorable toothpaste commercial taken off the air.