The world is facing a solar crisis, causing it to become colder and darker; during a crucial competition, Mima's mysterious power threatens to spiral out of control, leading to the reversal a 300-year-old spell.

In her final opportunity to enter the Young Patrons Competition, Mima's life takes a dramatic turn when she accidentally wakes up three witches; the rebel leader Akashi faces a tough decision as his leadership is questioned.

Mima realizes that she can no longer ignore her powers and needs to learn how to master her gift; after an unusual attempt at training without the supervision of the witches, Mima puts her best friend Ariel at risk.