In an Age of Peace that has existed for more than six thousand years of history. Together with the Ancient Heroes of Aionia world, Demon Lord established peace between the two worlds, where the humans of Aionia world and the demons of Nidral world work together to build a good relationship.

Demon Lord, who has dominated the Nidral world for hundreds of thousands of years. Today, someone stormed the demon lord castle and challenging Demon Lord. It was a young girl with long gray-white hair and red eyes full of determination. The girl had the appearance of someone the Demon Lord had known in the past, but she was not that person.

I am Heroine... No, I'm just a girl named Selina Matilda, who happened to be chosen by The Holy Sword Aneles. I am so sorry for my rudeness, great Demon Lord. But, I'm here to kill you!

Selina holding the Holy Sword Aneles firmly in her hand, she aimed directly at the Demon Lord in front of her with the determination to defeat Demon Lord. The Holy Sword shines with divine light, with Selina's iron will and unshakable determination. She must change her own fate.