When Maki Shouichi (CV: Kimura Takuya) brings his son Maki Mahito (CV: Santoki Souma) out of Tokyo during the war, Mahito isn’t exactly overjoyed about the prospect of having a new mother, or a younger sibling. However, he quickly realises that the grey heron (CV: Suga Masaki) that lives by the pond isn’t a normal bird after he hurts himself.