- Nagasato Daisuke is a 39-year old bachelor with an extremely negative attitude towards marriage, but by no means an unattractive man. However, he truly believes that he'd "rather be alone." Averse to taking the risk of bringing in other people into his living space, he protects it as if it was his castle, and is fully enjoying his idiosyncratic single life. Kumagai Hanako, on the other hand, is a 32-year old divorcee who works for a major trading firm. She has her own distinct thoughts about being single, doesn't want to get married again, and already planning for her life after retirement. She’s a hard worker who has a strong sense of responsibility for her work, but at the same time, has a critical temperament and is strict with others.
When these two meet, they fight constantly, but they're actually similar in a lot ways. When Daisuke's father and Hanako's mother barge into their respective homes, their comfortable single life comes to an end.