Those servants are pretty obvious Higurashi cameos. (Renon, Runon, Reina-Rena Manon-Mion, hurf) That being said, I'd be pretty damn disappointed if Ryu07 decided to throw yet another beloved Higurashi character into the Good-cleansing Evil-filling machine.
Actually... Come to think of it, assuming Erika is the bitchy Rika from Saikoroshi-hen, Rena and Mion just moving on to become temporary servants at the Ushiromiya mansion doesn't seem too far-fetched, does it?
