Little does Hana expect that getting lost on a rainy night will mean she is stuck in Exo's dorm as Jongin's pet dog.

Maeri was living happily with her adoptive father and friends in a time when magical and human populations on Earth were at peace. When the government forces Maeri to return to when she is originally from, she is into a world divided where she must work together with a magical idol group, EXO, and others to unite the globe to form the future she remembers while dealing with fate’s complications every step of the way.