Yukinari, a high school boy with a serious allergy to girls, is unexpectedly transported to a world called Seiren.
Seiren is unique because it's overwhelmingly populated by women, a stark contrast to Yukinari's life back on Earth.
His allergy, which causes hives upon contact with girls, poses a significant challenge in this new environment.
However, he finds an unexpected ally in Miharu, a girl whose touch doesn't trigger his allergic reaction, offering him a lifeline in this strange new world.
The story follows Yukinari as he navigates this female-dominated society, relying on Miharu's support while trying to understand his new circumstances and possibly find a way back home.