Prologue

1945
It's nearing the end of the war and everyone's hoping for victory.But when the nuclear bomb drops to the floor and explodes, the people and their princess Ling Su are evaporated,leaving the town desolate.

2018
It's 73 years since the bombing of Nagasaki and Kiko Yamada and her sister Kiyoko are two Japenese girls who live in Hiroshima are interested in history.They start to hear strange noises coming from the basement.Is this a victim of the nuclear bomb attack or a princess?A Warrior Princess?