On a midsummer day when the record-breaking heat wave continues, his son-in-law, Shinji, who has moved to Tokyo as a member of society, has returned to his parents' house for the first time in about three years. Mio, who had been mourning her husband and living alone, was happy to be reunited with Shinji, but Shinji had a somewhat unhappy expression. It seemed that Shinji was hurt both physically and mentally by being shaken by his fiancée. - Mio wants to encourage Shinji, so she gently hugs her sweaty body. However, the moment Shinji's head came into close contact with his mother-in-law's chest, he became strongly conscious of it as a woman.