Kasumi is the female lead in The Hills have Size. She is the object of Ryo's desires.
Kasumi starts the series as a frustrated housewife and mother of a young girl. Her husband is away quite often and when he is home is usually to tired to take care of her sexual needs. She is usually up late at night taking care of her own needs watching adult films while using sex toys to deal with her frustrations. Ryo, her husband's cousing, witness this one night and it has a profound affect on the young man as he has a hard time not thinking of the beautiful young woman. Kasumi's sister, Harumi, visits the family regularly and has a crush on Ryo that no one is aware of. One day before Ryo is to meet Harumi, Ryo crashes into an almost naked Kasumi as she is exiting the bathroom. The encounter leaves Ryo excited, a fact not lost on Kasumi, and the young man beats a hasty retreat.
Later than night, after Kasumi's husband once again neglects her Kasumi is taking care of herself when she declares that she would gladly take any lover rather than a toy and then remembers how Ryo felt against her body. Ryo, once again awake, over hears her cries of frustration and offers himself to her. Kasumi at first tries to remain loyal to her husband but gives into the younger man and the two make love with Kasumi declaring she wants Ryo to come inside her as it is a safe day. The following morning Kasumi tries to break things off with Ryo but the two again make love, this time anally as Kasumi is ovulating.
Kasumi, Ryo, Hamuri, and Kasumi's daughter are spending the day at the beach. At dusk she sends Hamuri and her daughter off for dinner leaving her alone with Ryo. She tells Ryo as they make out that her husband has a lover. The lover called and informed her of this fact. The previous night she was so distraught at this news she sought out Ryo to feel something. She tells Ryo this will be their last time together as she is determined to make things work with her husband. The two make love on the beach. When Kasumi confronts her husband about his mistress he declares that he needs more than just her body and refuses to give up his lover for his family. Kasumi leaves him. Ryo later searches for her and declares his love for her. Kasumi, in her hotel room, discards the wedding ring she forgot to remove and the two make love well into the night. Kasumi and Ryo are now a couple despite what others might think.
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