When staff suggested, "Can't you film something with your cousin living with you?" they handed the camera to AV actress Akari Hoshino, leading to a self-filmed sex scenario. Set in her private bedroom with Hoshino herself as the camerawoman, she captures intimate moments like underwear checks, aerobics, and bathing in this personal space. Cleverly exploiting her cousin's vulnerable position, Hoshino pushes the filming forward. Though the inexperienced cousin desperately resists at first, she gets excited while watching AVs and accidentally touches, eventually getting turned on during a scene of Hoshino roleplaying sex with her boyfriend and suddenly pouncing on her!