One day, high school friends Akira Houjou and Chiaki Asami flip a coin and make a vow that completely alters their destinies. Akira promptly drops out of school to join the yakuza, while Chiaki perseveres to become a politician's aide. Although they appear to have made diametrically opposed choices, the two friends feel like two sides of the same coin; they will do whatever it takes to reform Japanese society as they see fit.