Girls Bravo [Manga]

Yukinari Sasaki is an average high school student who was teased and bullied by girls to the point that he developed an allergic reaction to them. As a result, he breaks out in hives whenever he comes into contact with a female. One day, when he returns home from school, he gets kicked into his bathtub by Kirie Kojima, his neighbor, and is transported to Seiren (???? S?ren?, spelled as “Siren” in the Tokyopop manga translation), a mysterious world with a mostly female population. Eventually, Yukinari befriends Miharu Sena Kanaka as well as her sister Maharu.