Natsu and Lucy are rivals, they don't get along very well. Then their parents went on vacation, and made them "home alone" so that they could get along (planned by their parents). Lucy's parents also decided to leave Lucy to Natsu's hands take care of her while they are away. Lucy and Natsu had no choice because the Heartfilia mansion is locked with high security level and their maids and butlers are on a vacation while her parent are away. Will they get along or will it become worse? Who knows ??