Princess Sisia was to be offered as a sacrifice to the legendary "Tyrannical Demon King Atrolah" in place of her stepsister Sally.

However, the Demon King, who awoke from a long sleep, was in the form of a young boy and became strangely fond of Sisia.

Sisia felt a sense of fulfillment for the very first time in her life living with Atrolah.

But one day, while the two were out at a festival, her stepsister Sally and her former fiancé Worth, whom Sally had stolen, appeared before them⸺