Hazure Oujo desu ga, Imayo wa Taikou Denka ni Aisarete Imasu

Princess Saphir has a second chance at life. What can she do with it? The first time around was married off to Felix, the Crown Prince of Valoreia who holds a grudge against her family. Tricked into trusting him and ultimately framed for a crime she didn't commit, she was imprisoned and tortured until the third Prince, Leander, took pity on her and granted her the mercy of death. Her soul drifted before ultimately returning her to her own past, but this time she enters Valoreia armed with knowledge of what happened before, and a determination to change her fate.