Baka to Test to Shoukanjuu‎ - Volume 10, The Fifth Question

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.

Bags of salt, spices and sugar stacked from inside the shop all the way out into the streets. Merchants loaded with goods going flooded the streets with their carriages.

[The criteria for unlocking the system have been fulfilled.][System synchronization with host commencing.][Synchronization complete. Congratulations. You have been given a chance to become the most desirable human in this world, just as you wished.]“This isn’t what I wished for.”[What seems to be the problem?] the voice asked, a hint of curiosity in her tone.“I asked to be the most desirable human, not a woman!” he exclaimed, frustrated as he cupped his newfound breasts.Sylvester Lancaster, a dedicated and kind-hearted unactractive policeman, often dismissed and treated like a doormat, snaps after discovering his newlywed wife in bed with his best friend. Consumed by rage, he goes on a violent rampage, only to realize the horrific extent of his actions when the blood cools—he has committed murder. Panicked, he attempts to flee but is struck by a car and meets his untimely death.However, death is far from the end. Sylvester awakens in a morgue, only to find himself in a bizarre alternate universe—trapped in the body of a stunning young woman named Cara Bolton.In this new world where Sylvester has transmigrated to, vampires, werewolves, witches, and other supernatural beings coexist in a fragile balance with humans, their uneasy peace marked by underlying tensions and hidden conflicts. Among the supernaturals, vampires reign supreme as the most dominant and influential. The system reveals to Sylvester that he now wields two new skills: the power to read minds and the ability to detect lies, skills inherited from Cara, the body’s former inhabitant who was a fairy.The system assigns him quests to complete, allowing him to level up and gain all remaining skills a fairy possesses. Many of these missions involves sex, manipulating and exploiting people, as well as infiltrating the vampiric council.

I’ve always dreamed of becoming a villainess, but I never thought that I would actually become one….!

This is the story of a young girl who aspires to become a villainous noble girl who’s capable of growing stronger through every confrontation that she is faced with.

Disclaimer: The main character’s standards for a villainess are a bit off.