Akuyaku Reijou ni Erabareta nara, Yuuga ni Enjite misemashou!

Meliarose, the beautiful daughter of the esteemed Maxwell family, has been chosen to play the part of villainess to help bring together the story's hero and heroine, paving the way for a romantic tale that puts all the storybooks to shame. However, try as she may, her "wicked" and "devious" attempts at meddling seem to all but fail, leaving our protagonists no closer to finding true love.

(Source: MangaPlaza)