Senpai Oppai Kako ni Modoripai -Anohi Anotoki Sex Shiteokeba Yokatta-  

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....