On the anniversary of their matriarch's passing, the Shinjo family congregate in their ancestral village on remote Okinawan island of Aguni. In line with the ancient tradition practiced on the island, the family must carry out a senkotsu - or a bone washing ceremony - by exhuming the remains and ritualistically cleansing them. Returning home from mainland Japan is unwed daughter Yuko, who immediately sets local tongues wagging with her advanced pregnancy, while eldest son Tsuyoshi lashes out at their estranged father any opportunity he gets as he nurses his own wounds. The two are dismayed to find that their father Nobutsuna had been drowning his sorrows in alcohol. As the clan prepares to bid a last farewell to their wife and mother, they might just find that the journey forces them to face several other unresolved issues.
Three mothers have sons with the same name of Yu Ishibashi and they are all 10 years old. In Kanagawa, Rumiko Ishibashi 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, Kana Ishibashi 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, Asumi Ishibashi 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 three women are happy and busy raising their boys. Due to some little thing, their lives fall apart. Their anger and anxiety unconsciously head towards their sons.