Three mothers have sons with the same name of Yu Ishibashi and they are all 10 years old. In Kanagawa, Ishibashi Rumiko is 43-years-old and she works as a freelance writer. She is married to Yutaka, who works as a freelance cameraman. They have a 10 year old son Yu. In Osaka, Ishibashi Kana is a 30-year-old single mother. After her divorce, she has worked part-time jobs and raises her 10-year-old son Yu alone. In Shizuoka, Ishibashi Asumi is a 36-year-old housewife. She is married to Taichi and they have a 10-year-old son Yu. Her husband works as a salaryman. These 3 women are happy and busy raising their boys named Yu. Due to some little thing, their lives fall apart. Their anger and anxiety unconsciously head towards their sons Yu. Adapted from a novel of the same name.