The OVA format lets this thing commit fully to the bit: a one-shot parody that knows exactly how absurd it is and never apologizes for the premise. Kocho's sexiness is treated as a literal combat tool that stops working the moment a female spirit shows up, and the show finds genuine comedy in that constraint rather than retreating to fanservice. The chemistry between Kocho, her sister, and their human decoy carries you through without pretending there's a story that matters, just three people having fun fighting spirits for 30 minutes.

Heian University offers little in the way of coursework, but its astrology program comes with hands-on training. When a horde of angry spirits starts terrorizing the school, astrology student Kocho sets out to drive them off using both her magic and her physical allure. She fights alongside the professor of the Astrological Society, her energetic younger sister Koran, and Kosaku, a human who serves as bait for the demons. Trouble comes when a female spirit appears who is unaffected by Kocho's feminine charms. The single-episode OVA mixes supernatural action and comedy with plenty of ecchi fanservice.