Jigoku no Senki - The Lethal Demon

Jigoku no Senki is an erotically charged noir/action series written by Shiro Azuma and illustrated by Toshio Maeda that was originally serialized in 1977 under the title "Taxi Driver" but underwent a title change (feel free to speculate as to why) for its 3 volume tankoubon release in 1981. The story is about a former police detective who works as a taxi driver in order to keep his daughter on life support. He isn't just a taxi driver, though, but also an extremely efficient hitman and he has a personal score to settle...