Tanbo de Hirotta Onna Kishi, Inaka de Ore no Yome da to Omowareteiru

Synopsis:

Jin Mita, a rancher living in a little wide open town, finds an oblivious female knight in his rice field one morning. She appears to be from another world and goes by the name Seraphim. She has no idea what this world is like and has nowhere to go. Jin offered to take her in because he couldn't bear to see her in this way. However, it seems that the people around him think Seraphim is his wife...!? A beautiful female knight marks the beginning of a slow life in the countryside!