A man kidnaps a black-haired high school girl named Rina and holds her captive in his house. Drugging her, he does whatever he wants to her while she's defenseless. He sniffs her, gropes her crotch, and indulges in his desires. Rina wakes up from her slumber, shocked and panicked by the stranger before her. She struggles to escape, but the man strangles her and yells abuse at her. She gives up resistance, crying in fear as he rapes her. And so... Rina is trained as the man's pet... The man records this and distributes it online. After a brutal daily training routine, Rina gradually discovers the pleasures of sex and overcomes her fear. Eventually, she begins to crave cock herself. Spanking, choking, slapping, deep throating, squirting, forced orgasms, fainting, reverse training... This is the story of Rina Masako's awakened desire for pleasure.