Mayo Chiki! S01

Kenjiro Sakamoto has developed a high resistance to punches and kicks, as well as severe blows, due to his mother and sister being professional wrestlers and wanting to withstand their various finishing moves and holds. However, this has led to him developing gynophobia, an irrational fear of women. All it takes is for a girl to touch him for him to start bleeding from the nose and sweat like a dog, and in some cases, even pass out. His life has become even worse since the fateful encounter in the bathroom. When he tried to escape from a girl, he stumbled upon a discovery that the most popular student in their school, Saburo Kone, who is also the servant of the school's principal, Kanade Suzutsuki, is actually a girl who dresses like a boy. Saburo, who was shocked, attacks Kenjiro with all her might, severely injuring and knocking him out. When he comes to, he sees Kanade, who proposes to help him overcome his gynophobia in exchange for keeping her secret.