There are 2 different versions. One is 3 volumes ongoing (Bunko) by Nagase Sarasa illustrated by Murasaki Mai. The other is 1 volume ongoing by Nagase Sarasa illustrated by Yuzu Anko. By the cover image here it's the former. By the cover image at MangaUpdates, it's the latter.
The opening is a blatant copy paste, so maybe it's signalling it's a parody of the villianess fad mangas?
We certainly need more of those, a lot of the me too ones simply have no idea why the most popular ones work.
On to business: the art is clean, the heroine's interactions with other characters are fun, and the demon king is cute. Good enough for me, let's see where this goes!
Feels like an honest to good Frankenstein of other Otome game mangas. Beginning is straight up rip off of Duke's Daughter's intro, and the characters all seem quirky for the sake of being unique. Very surprised by the high rating tbh. Also, plot doesn't seem coherent. Her going to the demon lord is so random. Da hell?