Connie, an ordinary viscount’s daughter,
is saved from a malicious lady’s attack at a ball by a beautiful noblewoman ghost.
The ghost is Scarlett Castiel, the duke’s daughter,
infamous as a notorious villainess who was executed 10 years ago.

In exchange for her rescue,
Connie is compelled to investigate Scarlett’s case for her revenge.
As Connie goes undercover, enters into a fake engagement,
and even confronts powerful nobles,
she draws closer to uncovering an enormous conspiracy…

“From here on out,
I demand that you devote your life to making sure
I get my revenge!”