Anybody know of a manga, pretty sure it was a light novel adaptation, centred around solving cases related to ghosts. About a man and a girl in maid outfit who only eats chocolate. The villain was his supernatural school boy who wore a school uniform and a red umbrella and a kitsune mask.
Pretty sure one of the one of the cases had a woman asking our protagonist man for help over a spirit that haunted her.
Was like 2 volumes long.