During the winter vacation, Naoko (played by Kaseko Kishimoto) and her daughter Samami (played by Hirosue Ryoko) were on their way to visit their grandfather. The long-distance bus crashed into a cliff in an accident. Naoko died unfortunately, but Samami was miraculously saved. When Sanami woke up, she called her father (played by Kaoru Kobayashi) by his first name and said that she was Naoko.