Akuyaku wa Koishicha Dame desu ka?

In her past life, otome game villainess Millene was a Japanese high school girl. When she was young, she was a naughty kid, and now that she has met the sparkling 17-year-old Prince Rendor, her memories have returned. But the 15-year-old animal lover Millene once again has her heart stolen by him. While seemingly sticky and full of misunderstandings, she is trying her best to have a happy marriage, that kind of exciting and fairly sweet story.

(Source: Shousetsuka ni Narou, translated)