Our heroine was reincarnated as the villainess of her favorite otome game... but her favorite character is just a side character. Still, though, she adores him, so she's been trying to break off her engagement with the handsome prince she's supposed to marry in-game. But it's a bit hard, because he's rather unhinged and QUITE attached. He took her beloved side-character hostage and forced her to promise she will marry him... Then, under the guise of preparing her to become a "good homemaking wife"... the heroine was subjected to his depraved desires. She somehow manages to get permission from the prince to attend school, but by talking to the other guys, she unwittingly triggers the prince's jealous fury. Had she not learnt her lesson already...? Driven mad by his love for the heroine, no-one can stop the obsessive prince... However, due to a certain turn of events, he comes to realize that he truly deeply loves her. He turns over a new leaf, repents for his cruel behavior, and decides to pamper the heroine, but...? Her new lavish lifestyle has made the heroine conceitful and complacent. Crazily enough, she comes up with a crazy plan and escapes from the castle... Only to nearly end up being violated by monsters...!? Who arrives to save the day?