A world named Utopia, or "Arcadia."

The world was in chaos, plagued by numerous problems such as conflicts and the emergence of monstrous beasts.

In this world, Lucas, a knight possessing destructive power, encounters Ilia, the War Princess of Melody.

She is a Chanter, or "Choral," who manifests the miracles of magic through song, and a benefactor who once saved Lucas from despair.

However, the Ilia he reunited with was suffering from amnesia and didn't remember Lucas.

The cause was a curse. To her, tormented by the anxiety of her lost memories and the curse, Lucas offers a knight's vow, declaring, "I swear by this name, I will help you and be your strength—" as he rises to the challenge.

And so, Lucas and Ilia, alongside their companions, confront various problems and conspiracies, but eventually learn of an inescapable destiny and are forced to make a choice.

What will they save, and what will they sacrifice—?

This is a story of demise and salvation, woven with sword and magic, song and love.

A dark and sweet battle romance fantasy begins.