Historia
Part 1: Hiroshima, 1955. Ten years after the city was consumed by a scorching flash of light, a woman's soul is still deeply shaken by the earth-shattering explosion that devastated her home and changed her life forever... A family from Hiroshima struggles to come to terms with their survival of the atomic bombing of their city. The protagonist is Minami Hirano, about 20 years of age. Part 2: Set some decades later, the niece of Minami Hirano is bewildered by her father's mysterious disappearances. She and a friend follow him to discover what he is doing.
Sinopsis vía AniList (en inglés).