Mitsuo goes to Nagoya to visit Izumi, whose father left Izumi’s sad, bar hostess mother for another woman, so together they decide to confront him in Oita. Meanwhile, Izumi’s mother befriends Tora-san and together they travel to Oita to meet them, with Tora-san quickly falling for her en route.

Kuki is a veteran newspaper reporter who has been shuffled off to a book-development branch and finds escape in an illicit relationship with Rinko. Together they find the passion no longer present in their marriages.

This is the story between single mother housekeeper and mathematics professor,who has a brain damage.