Due to job hunting, I ended up staying with my relatives in Tokyo. I wondered if my sister Anna, who I used to play with as a child, was doing well, if she was living alone... but I was surprised to find out that she had become a hikikomori NEET! My sister is socially awkward and can't even look me in the eye, but I can't help but notice her plump body and her sloppy, erotic outfit of a tank top that shows her nipples and tight shorts. One day, I witnessed my sister masturbating too violently, out of frustration, and I was found out. I prepared myself for a scolding, but then she suddenly said, "I want to see a man's body too..."!?