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.