Hinata Sakurai, an ordinary girl with a secret identity as the Magical Girl Saint Lime, fights against the Viest Army to rescue her missing brother, who once was the heroine Saint Cherry. Now corrupted and transformed into an evil magical girl, Cherry has become her greatest challenge. With the power her brother entrusted to her, Hinata turns her sorrow into rage to save him, facing a great evil while discovering her true desire and nature.