Guren no Kusari: Crystal Harem Series

Detective Yajima is your typical well-seasoned, rough detective who has dedicated himself to his work: solving tough cases. Ryo, who was abandoned at the age of five and grew up on the streets, also dedicates himself to his method of survival: pickpocketing. Although they got off to a rough start, the pair of two opposites have finally found Peace in Paradise. Nothing can seem to break their bond now. Ryo accepts Detective Yajima even with all of his rough edges, and Detective Yajima accepts Ryo regardless of his past. But what will they do when that very past starts creeping up on them? What kind of incidents will they find themselves in next?

(Source: Futekiya, translated)