A J-girl gal is addicted to secretly masturbating while her family is away. She borrows her brother's porn magazine without permission, and when things start to get exciting, she plays a porn video with her headphones on at full volume. She doesn't notice when her brother comes home, and when he comes to get the porn magazine back, he sees her in an incredibly indecent act. The hot-blooded and horny brother attacks his sister, who is actually still a virgin.