The show follows five monster girls (Alice Witch, Jenna Frankenstein, Merlinda Summers, Nimona Catters and Rumi Nakamura), who arrive from different lands to study wizardry at the mysterious Wonder Monster island, alongside two boys who end up there by accident when their school building comes to life. Together, the children embark on adventures, uncover secrets, and learn magic from a great wizard named The Immortal. Despite her surname, Chloe Charming is an ordinary teenager, just as fascinated by magic as she is by witchcraft. Everything changes when she discovers a magical key that opens up a new world where Monster Island comes to life.
