Replica -????-
Karakara, Kemuri (Story & Art)
Right(→) to Left(←)
Manga Description

Manji, the murderer bodyguard known as Red Dog, joins Cards by chance and helps defeat Toys, a kind of playthings that kill. His weapon is a sword and his partner is Karu, a cold boy capable of transferring others injury to his body. In one mission, Karu is wounded and his secret is exposed. (Source: MangaUpdates)