Wolf×Red

Belle Epoque City is a dangerous place, overrun by monsters called "Freaks." The community is troubled by a rising rate of freaks and related crime, and the humans have come up with an innovative way to deal with it. They've created an agency called "Black Grims" that employs convict Freaks to fight against the criminals. This story follows one misunderstood, well-meaning wolf boy and his strict keeper, a girl named Ayane, as they work to protect innocent people (preferably girls, for the wolf) from the dangerous Freaks of the city.

(Source: MangaHelpers)