Misa, a teacher, married a colleague in her mid-20s and gave birth to Kojiro. However, as a result of their continued misunderstandings, Misa and her husband divorced when Kojiro was in junior high school. However, Kojiro, who grew up watching the two of them, naturally decided to become a teacher. Meanwhile, Misa was planning a trip for the first time in a long time with Kojiro and her ex-husband. However, the ex-husband suddenly couldn't go on the day before the trip. Misa decided to go on a trip with Kojiro. On the trip, the two of them...