Waltz for Baby
A man he's only just met asks Makoto if he can help him figure out who killed his son five years ago. Thus begins some detective work for Makoto, which ends up digging up things that perhaps should have remained buried in the past.
Aired 27/10/2020EP 4 - Waltz for Baby

2020
Ikebukuro West Gate Park
Crime-ridden Ikebukuro is a haven for violent gangs, the Yakuza, and home to Makoto Majima. To protect his friends, this charismatic troubleshooter mediates disputes among the warring factions—even fixing problems the police can’t. But when a rising tide of violence results in Makoto losing a loved one, can he ride out the storm, or will he drown in all the spilled blood that floods his streets?
(Source: Funimation)