Yukinari Sasaki, a typical high school boy, suffers from female-phobia and experiences an allergic reaction upon physical contact with girls. Unexpectedly, he plunges into a bath and is transported to an alien planet named "Siren," where female beings constitute 90% of the population. Here, he encounters Miharu, who he can touch without experiencing any adverse effects. Upon their return to earth, they encounter a group of eccentric friends and foes, who add to their daily dosage of humor, valuable teachings, and fan service.
