Hidaka Banri manga
[From Omanga]: A coming-of-age story from Jiro Matsumoto (the author of Freesia) about a young, aspiring photographer named Soma. He's going nowhere, stuck in a mire of sex and drugs, until a horrible end to a one night stand sets him on a path that changes his life forever. WARNING: Mature content. Do not be surprised if you come across disturbing imagery.
A short story collection of Jirô Matsumoto’s, things get nasty, and wet. Seriously, in each of those stories there’s enough body fluid sloshing about to fill a swimming pool. Note: This manga contains adult content. For mature audiences only.
From Illuminati-Manga: This world is broken, so are humans. Shuu is one of them. He's a talented sniper who keeps a broken android, named Alice. Together they live like hermits and make living by exterminating caravan robbers, until one day the woman that Shuu saved invites him to live in a commune.
The future. The people that migrated to an alternate dimensional space, seeking a new world to live in, started an armed rebellion in order to declare independence from Earth. Thus, multi-dimensional war broke out with the United Army of Earth. The battlefronts spread, and the fight grew long. In their desire to break the deadlock, the United Army of Earth decided to launch a large-scale offensive, deploying to the front line vast amounts of "Assault Girls" -- new arms that would render all previous weaponry ineffective. Piloted by outcasts and criminals, the members of the The 13th Independent Assault Girl Hunting Platoon -- dubbed "The Hyena Platoon" -- are tasked with hunting down and destroying rogue Assault Girl pilots, who have succumbed to the corruption that eventually befalls all pilots. Started as a oneshot in "A City of Honests and Heretics."
Freesia is set in an alternative Japanese society that is at war, and has passed a law legalizing retaliatory killings. If somebody kills your loved one, you are legally sanctioned to kill, or hire someone to kill, the victimizer. The manga is set around a character who works for a firm that specializes in these retaliatory killings. Summary obtained from Omanga
The story centers around Becchin, a high school girl who lives in a battle tank on a riverbed in Tokyo's Suginami ward, and her friend Mandara. Together, the two exterminate the zombies of dead Suginami citizens.