Tokyo Revengers: A Letter from Keisuke Baji Vol. 4 (manga)

The Tokyo Manji motorcycle gang has carved out a reputation as the toughest band of delinquents in Tokyo. No matter who stands against them in a fight, no matter how bad the odds, Toman always emerges undefeated. Yet its members all carry the scars of 'Bloody Halloween,' the night when a showdown with a rival gang saw their First Division Captain, Keisuke Baji, get senselessly murdered.

Months later, vice-captain Chifuyu Matsuno is still struggling to make sense of what happened. When he receives a letter from Keisuke Baji - written on the day of his death - it stirs up memories of all their years together...