Japanese name:

東雲 瞳

She is Ritsuka, Yuiko and Yayoi's teacher. She is very naive and innocent, and painfully aware of these characteristics. At twenty-three years old, she is teased and ridiculed for retaining her ears (and therefore her virginity) to such an age. She is visibly embarrassed, but as the story progresses, she gains confidence and pride over making her own choices.
Hitomi is greatly troubled by Ritsuka's mother and the injuries he sustains from her, and greatly desires to involve herself in the situation to make a change, despite her fears and her colleagues' dissent.
Her very caring and naive nature clashes spectacularly when confronted with Soubi. He brusquely rejects her and says he doesn't care for older women, although she has never made a romantic move towards him and is no more than three years older than him. Despite his cold treatment, Hitomi seems to have had some feelings for Soubi. His brash actions are mysterious—the only discernible reason being a general hatred towards teachers as a result of his experiences with Ritsu Minami.
Although he has rejected her, it can be noted that Soubi enjoys tormenting her to some degree.
This kind of behavior towards Hitomi may have stemmed from jealousy. It is interesting to note that Soubi refers to Hitomi as 'childish', despite her being three years older than he is. Yet he still respectfully calls her "Shinonome-sensei." The only way he degrades her is by her sexuality, possibly because Hitomi has remained a virgin while he lost his ‘ears’ at a much earlier age. In comparison with his extreme dislike of his own teacher figure, Ritsu, Soubi still manages to treat Hitomi as a subordinate, constantly belittling her.

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