Yuurei to Koi Shitai!

Kouichi doesn’t believe in the supernatural, even if it appears before his very eyes. He has an osananajimi, Aoi, who treats him roughly all the time, but he doesn’t mind it. One day, his house burned down and he was forced to move. However, his new home is haunted by a ghost, Nana. Kouichi isn’t fazed at all and actually tells her to just sit and be quiet. One hour later, it’s Nana that ends up pleading for him to let her stay with him. Aoi hears about this and isn’t happy at all. What will happen to this strange 3-way relationship?