Yo Sano

A single mother is being investigated into the death of her ex-husband, which brings to the fore the obscure details of her past.

One spring, Tasaka, an elementary school teacher, receives a new class of first graders. While taking the children's attendance, Tasaka is surprised to see a call girl he once had an encounter with standing among the parents in the back of the classroom. According to the school's files, her name is Yukako Sawada, and her child Eisaku has no legal father. The next day, Eisaku gives Tasaka a letter from Yukako asking to meet at the hotel where they first met, and Tasaka sets out with an uneasy feeling...

Taiji (Kawazu Yusuke), who works at Noble Cosmetics, wants to marry his girlfriend Tomie (Kuwano Miyuki), but is having a hard time saving up the money. On a night train, he casually takes a photo of a middle-aged man and a young woman sleeping close together in seats diagonally opposite each other. In reality, the man is Aizawa (Sano Shuji), the section chief at the government agency where Tomie works. Tomie tells Taiji that she is pregnant and wants them to get married soon, so Taiji sends Aizawa the same photo. This is to ask him to buy it...