学校でいじめられている姉。そんな素振りはまったく見せず、両親が共働きで一緒に生活をしていたが、ある日姉の学校の友達がやってきて、いじめっ子にボクは面白半分で童貞喪失させられてしまう。姉が見ている眼の前で…。それからというもの、いじめっ子が家にやってきて姉に嫌がらせをするためだけに、友達とセックスさせられてしまう日々。さらには友達は姉とボクとのセックスを見たいと言い出して…。姉と公開セックスするハメに…。最悪だ…落ち込むボク。そして責任を感じた姉は…。

My older sister is being bullied at school. She never showed any signs of it, and we lived together as our parents both worked, but one day her school friends came over, and the bullies took my virginity for fun. Right in front of my sister's eyes… From then on, the bullies would come to our house and force me to have sex with their friends just to harass my sister. What's worse, the friends said they wanted to watch my sister and me having sex… So I ended up having sex with my sister in public… It was the worst… I was depressed. And my sister, feeling responsible…