As Christmas approaches, Yu and the boys make plans for a party on Christmas Eve, although the manner in which Yu invites each of the girls leaves them to believe they are being asked out on a date. As each of the girls tries to prepare themselves for the day without letting on to the others, Naoto becomes paranoid that the other girls are planning to kill her. On Christmas Eve, with the boys unable to help Yu with the party preparations, he interprets the arrival of each of the girls as helpers sent by Teddie, giving each of them errands to do while he goes shopping...