Aijin o Kakou Reitetsu na Hakushaku to no Tenkeiteki na Seiryaku Kekkon, Soshite Kiraware kara no Dekiai, Sono Ketsumatsu

A man seeking family background, a woman seeking financial support. It was supposed to be a loveless, arranged marriage. But Renande falls in love with his wife, Elise, who is pure and kind to everyone, and the two begin a happy married life. But the story doesn't end with a happy ending.

(Source: Kadokawa, translated)