The Yokoyama family come together every year to commemorate the death of the eldest son, Junpei, who drowned accidentally 15 years ago while saving the life of another boy. His father Kyohei, a retired doctor, and mother Toshiko are joined by their surviving son Ryota, who has recently married a widow with a young son, and their daughter Chinami, her husband and their children. The family experience nostalgia, humour, sadness and tension as memories are shared and ceremonies performed.