Original title: 先パイ・乙パイ・過去に戻りパイ～あの日、あの時、SEXしておけば良かった～
That summer, that after school, she was waiting for me. When she was about to say something, I started running, leaving her behind. Regarding a different girl, she was doing something at classroom. She was actually naked. She must have been doing something secret. When I regain consciousness, she is actually doing something at classroom. Yes, I can see now what she is doing! So, what I should do is...
Download Senpai - Oppai - Kako ni Modori Pai ~Ano Hi, Ano Toki, Sex Shiteokeba Yokatta~ from k2s or fboom for free.