Dia is a ducal lady who lost her family and was raised in the royal palace.

After her fiancé, the First Prince, informed her of their engagement's annulment, Dia knew that the man she loved intended to murder her at the ball, now just days away.

This is a story about Dia, who lived alone and wanting for nothing in the royal palace of the Country of Eternal Night, striving to, at the very least, wreak some havoc on those who shredded her heart, as a final act.

And it's a story where the beautiful and cruel King of the Night Country, who has been observing Dia, unexpectedly finds himself completely embroiled by her actions.

Books up to Volume 2 have been released by Overlap Novels f. (More than half of Volume 2 consists of new content, so its structure differs from the web version.)