Yuuno, Arashiko

Yuno is Taro Sado's classmate. She has androphobia due to an attempted sexual assault by her former boyfriend in junior high school, and will attack any males who touch her, subconsciously feeling that she has to hit them before they hit her. She is also the one who caused Taro to become a masochist but despite her androphobia she develops a crush on Taro and is also hinted to be jealous as well when another girl is involved with Taro.

She occasionally gets into situations where she briefly forgets her androphobia in her eagerness to get closer to Taro (or is accidentally touched by him), and when she actually realizes what happens, she comically assaults Taro who, due to his masochism, enjoys it.

[Spoiler] It is revealed in flashbacks that Yuno is the reason why Taro became a masochist: when he confessed his love to her, her androphobia caused her to smack him hard, which triggered Taro's then supposedly suppressed masochistic personality.

Through other flasbacks, her androphoia has been revealed to be due to an incident during her middle school years. When she was forced to go out with an older student, Yoshioka, he tried to forcefully kiss her, which Yuno responded by scratching him. Yoshioka proceeded to violently assault her, which seeded and developed her fear of men, believing in the mantra "hit, or be hit" after the incident. [/Spoiler]