Luna Russell is a pretty average high school girl, with one exception...her house. She and her family have just moved into a gigantic house, so enormous that you could almost call it a mansion. After Luna discovers an underwater trapdoor in her swimming pool, she is sucked into another dimension. Soon, she finds out that a handsome boy lives on the other side of the trapdoor, and that she is stuck in his dimension? Will she be able to figure out their relationship, uncover the secret of the trapdoor, and get back home safely?