With the Second World War only a few years in the past, and Japan still reeling from its effects, two sisters – born to the same father but different mothers – struggle to make sense of the new world in which they are coming of age. Asako, the younger, has become obsessed with locating a third sibling, while also experiencing love for the first time. While Momoko, their father’s first child – haunted by the loss of her kamikaze boyfriend and their final, disturbing days together – seeks comfort in a series of unhealthy romances. And both sisters find themselves unable to outrun the legacies of their late mothers.