Saigo to Onmyoji to Sono Tsuma

Izumi, who is all alone in the world and can see supernatural phenomena, suddenly marries Haion, the last onmyoji protecting the imperial capital! Though unsociable during their married life, Haion recognizes Izumi's unique power of sight and is kind enough to stand by her. As a result, the distance between the two gradually closes...

(Source: Kadokawa, translated)