Ryusei Satou/Synopsis

History
Ryusei seemingly has a dark past with the gang, Yotsuya Kaiden.

Plot
Tokyo Revengers: Letter from Keisuke Baji is a spin-off which is about the days of the First Division of Toman before their Captain Keisuke Baji died. Ryusei Satou is the playful, charming and powerful First Division Vice-Captain of Toman in the series. He is Chifuyu's rival for the First Division Vice-Captain position as Chifuyu wants to become Baji's right-hand man and most trusted friend and even though it is not the case, Chifuyu sees Ryusei as an obstacle. The First Division of Toman is targeted by many gangs and Ryusei plays an important role in fighting off the gangs and protecting his gang mates.