I don't see a tag harem but maybe it is for the mayor, he gets all the girls so that's harem right ?I feel the same as if not I don't get why there is a harem tag as it is only suppose to be used if the MC has/gets a harem not when one is stolen from him or another character that isn't the MC having one. So kind of feeling a miss use of a tag here unless there is a way to avoid the NTR and get all the girls