Yuuka Sawamura/Fontaine was investigating a mysterious series of incidents involving women's panties being stolen, when she finally confronts the Panty Killer's Steel Robot. The source of her power, the Sacred Panties, are stolen from her, causing her to lose her magical abilities. Overwhelmed by embarrassment, Fontaine loses control and involuntarily urinates. The Panty Killer, unable to harness the power of the Sacred Panties, targets their owner Yuuka—but Yuuka transforms into Fontaine to fight back. However, weakened from losing the Sacred Panties, she fails to summon her full strength and is captured by the Steel Robot. Now, the imprisoned Fontaine falls victim to the Panty Killer's lewd and depraved advances…!