Kinou made Namae mo Yondekurenakatta Koushaku-sama ga, Kyuu ni Dekiaishitekuru no desu ga?

"Why are you acting like you love me so much?" Mariene is troubled by the sudden transformation of her cold-hearted and ruthless husband, Duke Alexia. She had been living a solitary life confined to his mansion, stuck in a loveless marriage, until one day he came to propose love to her, doting on...

Source: MyAnimeList