After work wasn't going well, I came back to my parents' house recently and started helping out at my grandfather's used bookstore. The countryside was boring and I was just wasting my time, but recently I found something to enjoy. That is playing naughty pranks on Mugi-kun, who often comes to this rundown used bookstore. I have a strange relationship with Mugi-kun, who gets an erection and even ejaculates after just a little stimulation. In fact, I'm just giving Mugi-kun sexual relief because I want to feel good.