Duction Man

Duction Man (ダクションマン) is a manga written and illustrated by Inokuma Shinobu. It was serialized in Big Comic Superior.

Plot
Ogi Juugo, a construction worker, separated himself from the the entertainment world long ago. He has a loving girlfriend called Misa Tsukahira, but when he finds out the truth about her, he decides to turn his world upside down.