[Yuzuha's original work, the second live-action adaptation of the latest series] During the summer, I ended up living in my cousin Yukinee's boarding house, and I was completely immersed in my sex life with her. Every day, we would clash with each other's sexual desires. Then, one of the boarding house residents, Hagika-san, returned home. Yukinee and I continued our "sex" life as usual, hiding it from Hagika-san, but our actions were noticed by Hagika-san. The cool Hagika-san was also engulfed in the erotic smell that clung to our actions, and she was masturbating repeatedly. And then, I happened to come across her masturbating...