Kitami Karen

Kousuke's childhood friend. They used to play together a lot when they were younger because their parents were on very good terms. However, after her classmates started teasing her about their relationship, they became estranged, and even told Kousuke that she hates him. However, in reality she is worried about the fact that she still hasn't apologized, and doesn't want to completely lose her relationship with him. Although Karen acts and appears to be a refined girl, in reality she is a huge idiot.

She has a complex about her small breasts, which Kousuke likes to tease her about. In exchange, Karen often kicks him with so much force that it actually stuns him. And because Karen has attended all-girls' schools all throughout her life, she is quite sensitive to the smell of men.