Freesia, tome 1 - Jiro Matsumoto

In alternate history Japan is engaged in protracted war and massive economic recession. Due to massive military spending, many prisons are shut and a Vengeance Act is created instead to allow those who have been hurt by convicted criminals to get revenge. Various Vengeance Proxy Enforcer firms are created to supply the massive demand for these.

Trigger warning: violence, gore, rape. 

The mc is Hiroshi Kano,a mentally unstable ex-soldier who suffers from memory loss and who might have supernatural abilities. He gets a job as a Vengeance Proxy. 

My main complain is that women are portrayed as sex objects or useless bimbos (or both) but it's not worse or better compared with other seinen.