Ari Artome steps into a new world with a bear by her side and a letter for the mother she once thought dead. The first day of summer vacation was her last on Earth. Caught unprepared by the sudden arrival of his old enemies, Ari's father opens a door to the Realm Sea and pushes her through with the promise they'll meet again in Taitamar, a distant world where her mother waits to meet her. With nothing but her hiking gear, a letter of introduction, and a glowing bear to guide her, Ari must survive a harrowing journey through the realms of gods and monsters if she ever hopes to see him again. Along the way she uncovers truths her father kept from her for sixteen years, including the fact he used to be Archmage, and that she might not be as human as she once believed. Is magic worth losing the life she knew? Will she even remember it when her humanity is gone for good?