Daisuke Nagasato (Shingo Katori) is 39-years-old, single and works at a stationary maker. He enjoys his single life. One the day he moves to his new apartment, he meets his neighbour Hanako Kumagai (Juri Ueno) for the first time due to an unpleasant situation. Hanako is 32-years-old and single. She is also an OL and a divorcee.

Daisuke's single life faces a crisis. His father Yozo (Toshiyuki Nishida) and younger step-brother begin to live at his apartment.