Nana has been married for a year to her former boss. She lives with her college-aged son, Kazuki, and they seem to be enjoying a harmonious life. While her husband is supportive of their efforts to conceive, his lack of passion leaves her feeling unfulfilled and frustrated. Then, her husband's long-term business trip is announced… As she begins living alone with Kazuki, he suddenly becomes more affectionate, saying, "We're family now," which confuses Nana. But with her husband away, she finds herself with a lot of free time…