Misa, who is a teacher, married a colleague at work in her mid-20s and gave birth to Kojiro. However, as a result of continuing to live in passing, Misa and her husband divorced around the time Kojiro was young. However, Kojiro, who grew up watching the two of them, naturally went on to become a teacher. Meanwhile, for the first time in a long time, Misa was planning a trip with Kojiro and her ex-husband. However, the day before the trip, my ex-husband suddenly couldn't go. Misa decided to go on a trip with Kojiro. On that trip, the two of them ...