Replica

Replica (Replica -レプリカ-) is a manga series by Kemuri Karakara. It was serialized in Comic Avarus.

Plot
While trying to find a job, Manji, a for-hire bodyguard, also known as "Akainu (Red Dog)", meets Karu who works for "CARDS". Discovering that Karu's mission is to exterminate the deadly "TOYs", which mindlessly attack any living things, Manji can't help but forcefully tag along to relieve his boredom.