My work wasn't going well and I recently returned to my parents' house, helping out at my grandfather's second-hand bookstore. The countryside is not fun and just a waste of my time, but recently I have found joy. It's a prank on Mugi-kun, who often goes to this desolate second-hand bookstore. Mysterious relationship with Mugi-kun who gets an erection and ejaculates after a little stimulation during a service. In fact, Mugi-kun's sexual processing is an excuse and I just want to feel comfortable.