A man kidnaps and imprisons a schoolgirl named Koharu. He drugs her, taking advantage of her defenseless state, sniffing her, groping her, and indulging every whim. When Koharu awakens, she's terrified by the unfamiliar man and tries to escape, but he chokes her, forcing her to submit. She cries in fear as she becomes his plaything. He documents her transformation into his pet, filming and distributing the videos online. Over time, Koharu gradually discovers sexual pleasure amidst this cruel training regimen, overcoming her fear. Eventually, she starts seeking out the man herself. Through restraints, nipple play, slaps, and forceful creampies, Koharu evolves into a creature driven solely by pleasure.