In a bustling modern Tokyo where hidden magical portals connect to whimsical realms, Anii is an ordinary 18-year-old high school girl who stumbles upon an ancient amulet during a school trip. This artifact awakens her latent ability to summon elemental spirits, turning her daily life into a secret adventure of balancing studies, friendships, and mystical quests. Orphaned young and raised by her kind aunt, Anii dreams of becoming a renowned artist while protecting her city from shadowy threats emerging from the portals.