Yamada-san is a little plain and serious and Fujisaki-san is popular in class. Through an unexpected turn of events, I became "masturbation buddies" with these two girls and masturbated together. I was leading a fulfilling masturbation life, jacking off as much as I wanted using the bodies of the girls in my class as raw sexual material but when I started masturbating with Fujisaki-san's vagina, our relationship became awkward. It was supposed to be just masturbation but my emotions were wavering. Was it masturbation, sex or love? Will our "masturbation buddies" relationship end like this...?! Then, one day... Yamada-san called me out to the back of the gym and what did she say to me there...?! Is it friendship, love? Or...? What will be the outcome of our "masturbation buddies" relationship?! This is the final volume of the "masturbation buddies" series!