Hina Sakurai is searching for her missing older brother. While she appears to be an ordinary girl, she leads a secret double life. She is a magical girl fighting for justice against the evil monster organization "Veast" using her sacred powers. Yes, she is none other than Saint Lime! "It'll be okay. Not as long as I have this power—the one my brother entrusted to me!" Her older brother—and her idol—was the magical girl Saint Cherry. But Cherry has already fallen into the clutches of the Veast monster Devil Beetle, transformed into an evil magical girl. Determined to win back her beloved brother and the ultimate heroine, Saint Cherry, Lime channels her sorrow into rage and rises up as a new magical girl! But what true desires and hidden nature will Lime discover at the end of this battle...!? To rescue her sibling—who has been corrupted by evil and transformed into the magical girl Saint Cherry— Saint Lime now stands tall against a massive force of darkness!