Yukinari Sasaki breaks out in an allergic rash at the slightest touch from a girl, a condition that's made him a target for bullying since childhood. Falling through his bathtub drops him on Seiren, a planet with almost no men, where he meets Miharu Sena Kanaka, the only girl whose touch doesn't set him off. When Miharu follows him back to Earth, his quiet, girl-averse life turns into a crowded comedy as more women from both worlds start showing up.