Yuzuka Hanami leads a simple life, despite her busy parents, aiming for academic excellence. On the flip side, Miton, an alien being, can turn his master into a magical girl to combat evil. With fewer foes around, Miton, now destitute, shelters in trash heaps. Spotting Yuzuka, he proposes his magical girl services. Reluctantly, Yuzuka accepts but reconsiders upon realizing her transformation results in a swimsuit costume, questioning the newfound journey ahead.