同郷で同じタイミングで上京した幼馴染みの六花と、話の流れで恋愛感情抜きのキスNGの性処理セックスするだけのセフレ契約をする。最初はタダマンが出来て満足だったのに他の男と仲良くする六花に嫉妬してしまう…何者にも縛られたくない六花にいつしか心を奪われていき、恋人に昇格したい一心でセックス中にコンドーム外してゼッタイNGの中出し敢行すると…

Rikka, a hood friend from the same hometown who moved to Tokyo at the same time, and I ended up making a friends-with-benefits arrangement where there are no romantic feelings involved and kissing is strictly forbidden. At first, I was satisfied with getting free sex, but I became jealous when Rikka got along with other men… I gradually became captivated by Rikka, who doesn't want to be tied down by anyone, and in my desperate desire to become her lover, I took off the condom during sex and went ahead and ejaculated inside her, which was absolutely forbidden…