Yukinari, a diminutive high school student, endures a history of mistreatment and bullying from girls due to a peculiar affliction that causes him to break out in hives at the slightest female contact. His world takes a fantastical turn when he is whisked away to Seiren, a hidden realm teeming with women and scarce in men, orbiting Earth. Amidst this enigmatic city, Yukinari finds solace in Miharu-chan, a female companion whose touch defies his allergic reaction.