A college student named Kikawa moved into an apartment complex to attend school and found himself developing feelings for his neighbor, Mizuki. She was shy, had a homely appearance, and her glasses perfectly complemented her stunning beauty. One night, when Kikawa heard his house's chime ring, he discovered Mizuki standing there without her glasses, swaying her breasts while performing oral sex on him. Confused and embarrassed, Kikawa confronts Mizuki the next day about the incident, only to learn that it was actually caused by her alternate persona, 'Mizuki'.

大学に通うためとあるマンションに引っ越してきた吉川は隣に住む人妻‘みづき’に好意を抱いていた。控えめな性格、家庭的な一面、そしてなによりメガネがよく似合う美貌は吉川を魅了していた。そんなある晩、吉川の家のチャイムが鳴る。見てみるとそこにいたのはメガネを外しておっぱいを揺らすみづきだった。訳も分からずフェラをされてしまった吉川が翌日みづきに相談するとそれは別人格‘ミヅキ’の仕業だと言われ…。