Shi no Tenshi wa Namida wo Nagasu

In a world where killing meant living, there was a girl called Kanoa. Tired of the endless bloodshed and looking for a purpose in staying alive, she decided to run away from the organization to which she belonged. And so, what she stumbles upon is what was once known as the city of Tokyo, but now, in the not-too-distant future, is recognized as a country: the country of Tokyo. Yet, having met a girl who would then change her life, Kanoa now finds herself having to deal with several leaders of the criminal world. An action-packed sci-fi story set in the not-so-distant future, where people are treated as weapons searching for meaning in their lives begins! (Source: Shueisha, translated)