The manga centers on Kamo and his partner Tora, who work in the underworld as "avengers for hire," taking on jobs from the victims of violent crimes and families seeking vengeance for wrongs done to them. (Source: AnimeNewsNetwork)

A spin-off series set 6 years before the events of Zenaku no Kuzu focused on Yumeji Sonoda's college days.

The murderer Konno Chika stands out in the story of "Gedou no Uta." A spin-off revolving around "urban legends" begins with her as the main character! The door to a mysterious world opens when she meets the occult researcher Kuze! A spin-off of "Gedou no Uta"! (Source: Shonen Gahosha, translated)

https://bigcomics.jp/series/65f57fd2183cd/

Collections of one-shots that won the monthly Hop Step Award from 1987 to 1996.