【Fitch専属女優・木下ひまりと大人気同人サークル・三崎の初コラボ！】「ユータの姉ちゃん美人だよな」軽口のはずだった一言から、すべてが狂い始めた。自分にとって数少ない友人トシヤに頼まれ軽い気持ちで姉の写真を見せてしまった僕。やがて二人は急接近し、‘年下に興味ない’はずの姉が、トシヤのペースに飲まれていく。ヤリチンでコミュ強の友人のセフレにされるのを僕はただ見ていることしかできなかった…。

[Fitch exclusive actress Kinoshita Himari and popular doujin circle Misaki's first collaboration!] "Yuta's older sister is pretty, isn't she?" It was supposed to be a lighthearted remark, but everything started to go wrong. I showed my sister a picture to Toshiya, one of my few friends, at his request. Soon the two of them grew close, and my sister, who supposedly had no interest in younger men, was swept up in Toshiya's pace. I could only watch as she became a sex partner for my smooth-talking, womanizing friend…