The Contract Between a Specter and a Servant, Vol. 3 (light novel) — Michiru Fushino

After nearly dying and being pieced back together, Masamichi has gotten used to working at the antique shop Bougyoudou for the handsome and mysterious Shino, who saved his life. The man is actually a specter who has been living as a human since the Heian era thanks to a curse from a spiritual medium. As Masamichi gets to know the gruff man and discovers his kinder side, he begins to feel some strange feelings for the specter. Then one day, a visitor from London arrives with a request from his very wealthy boss -- a request concerning a haunted house and the evil spirit within it...