Akumetsu

Akumetsu (アクメツ, Akumetsu) is a Japanese manga series written by Yoshiaki Tabata and illustrated by Yuuki Yugo. It was serialized in Shounen Champion.

Plot
Nagasawa Shiina is just an average 3rd year high school student until her parents' company goes bankrupt. In order to pay the bills, she sells herself into prostitution. At her first job, a mysterious masked man crashes the party... and it's someone she knows.

Akumetsu is the story of Shou, a vigilante that's out trying to straighten the corrupt Japanese Government through terrorism with his "One man, One kill" code of action.