Arcadia was once a beautiful world. Now it is a land under siege. Against the horrifying creatures known as Thanatos, there is only one known defense: Purifiers, rare humans gifted with the ability to exterminate the life-draining monsters. But Purifiers are few and the Thanatos are multiplying, so when the mysterious Nyx discovers 16-year-old Angelique, he becomes doubly committed to recruiting her for the team of Purifiers he is organizing. Not only is Angelique a Purifier, she's the first female Purifier in recorded history. Moreover, there is an ancient prophecy Nyx is aware of: one of a woman with special powers, the "Queen's Egg," whose future will be inextricably tied to the fate of Arcadia!

Ayahatori-that is the given name of the family possessing a mysterious power. They have the power to be able to summon and use beings and people from secret ancient writings. During the Ayahatori initiation ceremony, high schooler Kozakura Saaya summons one of the three most beautiful women in the world, Ono no Komachi. However, what appears in front of her is a man with matchless beauty-!?