Fuku wo Nugisutete

It has been an entire week, made up of seven excruciatingly long days, since Rio last had sex with Akane, his girlfriend and their school's student council president. It was then that she promised to let him have sex with her without a condom, but only if Rio managed to hold his lust in check for one whole week.

After the bell rings and the lessons for the day have ended, Akane calls for Rio, signaling the completion of their deal. However, before Rio can get his long-awaited prize, there is a small "trial" he has to go through first.