For two days, Mizuki has been doing whatever Tanabe wants with her, under the promise that he will delete the obscene video of her younger sister. Mizuki
has been acting strangely after being forced to take the contraceptive pills, but she has accepted Tanabe...
One day, when Mizuki is taken out, she witnesses a group of students from her school having an orgy with a large number of men.
Among them is her beloved younger sister, Aika...!?
妹の卑猥な動画を削除するという約束の下、二日もの間田辺によって好き勝手ヤられてきた瑞希。
避妊○といって飲まされる○で様子がおかしくなりながらも、瑞希は田辺を受け入れていた…。
そんなある日、外へと連れ出された先で、瑞希は同じ学園の生徒達が大勢の男達と乱交している場を目撃してしまう。
その中には最愛の妹である愛華までいて…!?
