Mayu works as a psychological counsellor at a hospital. One day, she is counselling a young girl who is unable to do anything other than say her own name, when unusual things gradually begin to occur around her. Around that same time,
Mayu’s younger brother Kazuma goes missing. According to what his friend Yusuke said, Kazuma had mistakenly entered a forbidden site while making his name as a YouTuber, and had become rather strange after. While looking for clues, Mayu watches a video that Kazuma had uploaded. She comes upon a video clip that is connected to the young girl under her care.