A manga about giant mechas that are operated by soldiers and look exactly like teenage school girls.

(Source: MU)

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.

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

A short story collection of Jir? 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.

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.

(Source: Illuminati-Manga)

From Jiro Matsumoto (the author of Freesia) comes a story of three childhood friends - Nicolo, Cookie, and Naomi - who grew up in a sleepy backwater town on an uncivilized planet. They struggle to get by while holding on to their dreams of leaving town and finding a better life... but can their friendship endure the tests of time? Can it withstand invading armies, broken dreams, conflicting ambitions, divided loyalties, jealousy, and even betrayal?

[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.