Orenchi ni Kita Onna Kishi to Inakagurashi suru Koto ni Natta Ken  

Regarding That We Decided to Live in the Countryside With The Female Knight Who Came to Us, 俺んちに来た女騎士と田舎暮らしすることになった件

Saeki Kanji, 32 years old and unmarried, resides in a rural area of Japan that's experiencing decline. Following his graduation from university with an economics degree, he worked as a salary man at a major corporation in Tokyo before retiring to manage the family farm in Miyama village after his parents passed away. He embraced a simple farming lifestyle. One day, a woman clad entirely in armor knocked on his door seeking shelter. She stated that she was royalty from another realm and couldn't return there. Eventually, she became part of Kanji's household and assisted with local agriculture issues.