Heart Devil [OP Yandere Schizo Ramble LitRPG XD]

A demon from another world is transported to her favorite novel, only to discover she was reborn a higher species being, a devil. She also finds out she was born a couple of years before the novels beginning, infinitely far away from the garbage ending. With that knowledge in mind, her mission was clear. Find her favorite overpowered side character, save him from his terrible fate, and since she was now a cute devil, slip in a marriage contract for her hard work! A perfect start to her perfect story. But she soon figures out having the blood of a higher being is a bit different than having the blood of mortals. As a devil, getting what you want is obvious, but for them, how you get it matters much more.