In the kingdom of Fenizard, where the hero had slain the demon king and peace and prosperity were assured.

Ariana, a member of the royal family, was forced to become queen at the tender age of fourteen, only to be killed at her coronation.

However, she was revived by the power of Rai, a demon boy who was humanity’s natural enemy.

To remain queen and obtain an immortal body, Ariana made a contract with Rai.

“Please give me a body that will never die! I’ll give you anything!”

“You said it, right? It’ll be too late for regrets.”

A human girl and a demon boy.

Two who should never have crossed paths strive for a ‘someday’ when they can join hands.