A brother and sister learn their biological grandfather was a kamikaze pilot who died during World War II. During their research into his life, they get conflicting accounts from his former comrades about his character and how he joined his squadron.
After the collapse of their relationship, Kiwako abducts the 6-month old child of a man she was having an affair with. Raising the child as her own, it is four years before the authorities catch up with her and the young child.
A group of junior high school must find out the truth of their classmate's death is he was killed by someone or committed suicide.
