One Shot Killer

There is a story that members of the mafia tell each other: the story of the gun that never misses—one that always kills with a single shot. But it's just a story, of course. When Luc, a member of one of the Three Families, meets a boy named Kil along with a note asking him to protect Kil for one million Euros, Luc jumps at the chance. But soon after, Luc's famiglia is attacked, and he comes to realize that the gun that can kill anyone with a single shot is right beside him—Kil is the gun. Source: Mangamo