26 years ago, a woman named Kaminazuki Kyouko was assaulted by a beastman, after which the man committed suicide in the mountains. Six months later, Kyouko, pregnant with the beastman's child, suffered intense labor pains and died when her abdomen was torn open during childbirth. Time passed, and in the present day, Kaminazuki Nozomi, working as an insurance saleswoman, is arrested by an organization called Beast SWAT for a crime she doesn't remember committing. Nozomi is actually the offspring born from her mother Kyouko's torn womb, her father being a half-human, half-beast creature known as a Beast. Deemed to carry the Beast gene, Nozomi is sent to Dr. Wakagi's experimental facility. When she resists in an attempt to stop the doctor's descent into madness, she is thrown into a cage containing Beast A, whom the doctor had been hiding. Beast A, having not had prey in years, gives in to his uncontrollable desires and repeatedly rapes the screaming Nozomi. As she is violated by Beast A and absorbs his semen, Nozomi begins her transformation into a Beast. Dr. Wakagi restrains her and begins a series of human experiments—forcing her to drink semen, stimulating her erogenous zones, and administering electric shocks. Meanwhile, Minami, a Beast SWAT officer who arrested Nozomi, learns of Wakagi's experiments and, ignoring orders from his captain, rushes to save her. However, Beast B, wielding tentacles as weapons, lies in wait along his path. Will Nozomi manage to escape the hellish experiments and reclaim her freedom? [HAPPY END]