Boku wa Nanadome no Jinsei de, Kaibutsu Hime wo Te ni Ireta

Hugo is stuck in a loop, repeating his life over and over, only to be betrayed and murdered by those closest to him—his own family—every single time. But enough is enough! Now on his seventh life, he swears revenge. After hearing rumors that the powerful archduke’s daughter is really a bloodthirsty monster, he offers himself as her groom in the hope that the allegiance will give him the power he needs or that she will at least kill him and free him from his misery if not. Little does he know, his meeting with this beautiful monster princess will intertwine their fates and change his life forever.

(Source: Yen Press)