Aoi is a studious girl dating her classmate Mibu-san, but her life takes a dark turn when a mysterious man enters her home. Claiming to be there at her mother's request, he uses a shady app and hypnosis to convince Aoi that she needs "sexual practice" to be a better partner for her boyfriend. As the man manipulates both Aoi and her mother into erotic encounters, the boundaries of family and trust are shattered by a sinister digital influence.