Kore wa Wareware Fuufu no Koto de,

It is the Sengoku period. Tadaoki Nagaoka lives only to ensure the survival of his family. He never doubts that this is the natural order of things. As a sign of his loyalty as a vassal, he is suddenly ordered to marry. His partner is unexpectedly a girl with an unusual appearance... (Source: Kadokawa, translated)