Boys on the Run

'Boys on the Run (ボーイズ・オン・ザ・ラン) is a manga written and illustrated by Kengo Hanazawa. It was adapted into a live action film in 2010 and a drama in 2012

Plot
A 29-year-old lonesome salesman falls in love with an attractive woman but he has a rival. He takes up boxing to fight his rival.