In post-war Japan, a government-funded program of organized violence called the "Tokyo Loop Line Duels" is promoted to maintain law and order—and it works. Representatives from each station on the Yamanote line battle for control of their territory. Any defeat could mean losing family members, friends, money—or worse. Fast-forward to now, in 2020; a new station has opened up. Everyone, including the popular rookie, Koinosuke, is itching to join the fray for the top spot. Will he be victorious? Or will violence consume them all?