I decided to watch Ena, a positive gal in my class who is rumored to have a lot of experience in hyakunin-ziri, who is the complete opposite of my negative male self, study! She is the complete opposite of the dark side. Once the test was over, the relationship was supposed to end...but he promised to do something naughty in return for that [thank you]! However, contrary to the rumors, she is actually inexperienced and single-minded... A youthful and innocent love story that is filled with innocent yet erotic sex.