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Kazuhiro splits up with Fuyuko. Natsumi tells him that she is in love with someone else and can't live with him anymore.She moves in with Kyoko and starts visiting Naruo every day. Before long, it's summer, and Natsumi runs into Kazuhiro again at an awards ceremony. When the party ends, she chooses to visit Naruo instead of going out with colleagues. Is this really the life she wanted?

Fuyuko calls Natsumi's office and asks her to meet up.Despite being a homewrecker, Fuyuko is bold and unapologetic towards Natsumi, plainly telling her she should leave Kazuhiro. After saying her piece, Fuyuko quickly leaves.Meanwhile, Kazuhiro is drinking at a bar by himself, remembering the young postman he met earlier in the day.

Natsumi runs into Kazuhiro at an author's end-of-year party. Unexpectedly, Kazuhiro does an about-face on his previous plans, saying he doesn't want to divorce her and wants to spend Christmas with her instead of Fuyuko. Natsumi rejects him with a smile.On Christmas Eve, Natsumi brings fancy ingredients to Naruo's apartment, where they throw a modest party for two.

It's spring, and Shohei's book is published. Natsumi runs into him at a bookstore, and they grab soba together. Things become tense when Kazuhiro and Fuyuko walk into the same restaurant. Shohei lets slip that he has plans to work with Natsumi. Kazuhiro confronts Natsumi about it at home, leading to an intense argument. Natsumi must face the hard truth that her romance with Naruo is fading.

Natsumi visits Naruo at his house. Kazuhiro calls out of the blue. Natsumi doesn't pick up, but still rouses Naruo's suspicions.The next day, Natsumi tries to persuade Shohei to write his next piece for her. He repeatedly avoids the subject, to Natsumi's frustration, which worsens when Kazuhiro texts her the next day to press her on why she didn't pick up.

Natsumi is at work when she realizes she left her phone. At that very moment, Naruo rings her and Kazuhiro, who dropped by the house, picks up. Kazuhiro grows suspicious. Why was the "post office" calling Natsumi? Later that night, Natsumi dines with colleagues at the office as Kazuhiro strolls in unexpectedly with Shohei, an up-and-coming author.

Natsumi is exhausted from working non-stop but finds Naruo's presence comforting. Anxiety worsens when Director Fujii wants her to secure Shohei

Natsumi is an editor at a major publisher and her husband, Kazuhiro, works at a rival company. After 8 years of marriage, they have no children, and Natsumi still uses her maiden name. Little does she know that young postman Naruo stares longingly at her every time she comes by. One night, Kazuhiro makes a confession: He is having an affair with Fuyuko, a college student.