Monmusu H na Ongaeshi! ~Anata no Oyome wa Watashi Dake!!~

I was in the process of moving into my grandfather's old place for college.
There was a weird vibe that gave me a sense that someone was there.
That day, I met... people?... who I will never forget for the rest of my life.

The story of Sho Jinnai and 3 spirit girls who propose marriage to him.

[From DLsite English]