Zerozaki Hitoshiki no Ningen Kankei: Zaregoto Tsukai to no Kankei

The Zerozaki Clan is a family of demonic killers, ranked third among the Killing Names. A boy with eyes like that of a dead man and a serial killer with a tattoo on his face. The story of their encounter and the never-before-told truth of the Kyoto serial killer case is finally revealed! The motivation of Zerozaki Hitoshiki, and its miserable ending......?!

(Source: Kodansha, translated)