A program designed to show each girl her perfect fantasy with Ichika should be nightmare fuel for a harem protagonist, but instead it becomes the permission structure the show needed: every girl gets to want him without apology, without compromise, without another girl in the frame. The World Purge doesn't resolve the harem, it validates it. This is what the series was always building toward, the moment where the competition stops being a joke and becomes honest.
Ichika's life at the IS Academy takes a surreal turn when a mysterious program called "World Purge" floods every girl's mind with vivid fantasies of their deepest desires. Each pilot experiences their perfect scenario, their ideal version of reality playing out in vivid detail. What begins as harmless wish-fulfillment quickly becomes something darker as the illusions refuse to fade, pulling the girls deeper into worlds where their dreams feel more real than waking life. Caught between multiple timelines of manufactured perfection, Ichika must navigate the chaos of girls trapped in their own paradise while uncovering what World Purge actually is and who unleashed it. The barrier between fantasy and truth collapses, forcing him to confront uncomfortable questions about desire and choice. Framed as a comedic romp through romantic scenarios, this OVA strips away the school hijinks that defined earlier entries and leans into psychological territory, blending the series' trademark romance with genuine unease about losing yourself to manufactured bliss.