Doku Oya ni Fukushuu Shitai Akuyaku Reijou wa, Keiyaku Konyaku Shita Koori no Kikoushi ni Dekiai Sareru

"I have awakened to true love!" With these words, Adeline, the daughter of a duke, is broken off from her engagement by the prince. While the prince and the baron's daughter live happily together, Adeline is imprisoned and then murdered. When she wakes up, she finds herself reincarnated as their daughter, Princess Cecilia! Vowing revenge, Cecilia Adeline teams up with her brother-in-law from her previous life, the ice prince Elvis. At first, they think it's just a simple cooperative relationship, but gradually, something starts to change about him --!?

(Source: Gaugau, translated)