A timid insurance agent investigates a possible insurance fraud case that involves a death. As the facts are slowly revealed, he becomes progressively more frightened.

The main characters are the Mamiya brothers who are living together although they are over 30-years-old. Unconcerned with appearance and reputations, they enjoy their life in their own way. The only concern is the lack of girlfriends. One day, however, a change occurs to their mundane lives. The elder brother, Akinobu (Kuranosuke Sasaki), falls in love with a girl at a video shop. The younger brother, Tetsunobu (Muga Tsukaji), scrambles around to aid his brother achieve love and arranges various dates. The elder brother strives to return the effort, but gets the cold shoulder. The two brothers return to their original lives, continuing with their ordinary, but happy days.