On a certain day, classmates Akira Houjou and Chiaki Asami toss a coin and pledge a promise that utterly alters their destinies. Akira promptly abandons school to enlist in the yakuza, whereas Chiaki perseveres with the aim of becoming a political aide. Though their decisions appear diametrically opposed, both friends regard themselves as twin facets of a single coin; they will pursue any means to reshape Japanese society as they deem appropriate toward a brighter future for all citizens, ensuring progress and unity together.