Keiji Yanagida and Chika Mizuno hate each other's guts. One's the nerdy class rep with a closet perverted streak, and the other's a haughty, superficial underachiever with a very short fuse.
One day, Mizuno ropes Yanagida into being her practice dummy for giving head. Yanagida reluctantly goes along with her -- until she admits she's only doing this for the sake of her would-be boyfriend: the captain of the soccer team, Takeda. Deeply offended, Yanagida snaps and forces himself on Mizuno. Naturally, she doesn't take this very well, but after Yanagida picks a fight with Takeda when he overhears him badmouthing her behind her back, she starts to see Yanagida in a different light.