High school student Morisaki Yui secretly defends her city as the magical heroine Pony Celes, a double life that becomes complicated when her childhood crush, Ginga, moves into her home. When a spider monster named Spidarg takes Ginga hostage, Yui rushes to save him but finds herself trapped in an unbreakable web and subjected to a humiliating sexual assault while he is forced to watch. Rallying her fighting spirit with the help of her mascot Polka, she summons a burst of holy energy to break free and destroy the enemy. Afterward, she successfully rescues Ginga, though he begins to suspect that the masked heroine might actually be Yui.