Nana Maeno, a rebellious niece, is trained with love to become an obedient pet. On the third day of captivity, she attempts to run away but fails and is restrained with a collar and handcuffs. Unable to use the toilet, she spends the night in wet pants. As she wipes her crotch, she lets out moans. Her urge to pee increases when she gets horny, leading to another accident. She is then made to wear paper diapers as a precaution. By the eighth day, she has become more docile and is allowed to remove her handcuffs. She cleans her soiled diaper and licks her wet pussy. She becomes accustomed to sexual play, handling and licking the cock like a toy. Stimulation with a vibrator over the diaper causes her to lose control and piss herself. By the fifteenth day, she has become an obedient diaper pet, showing affectionate gestures and strong female desires. She is trained to use a pet toilet, removing her diaper to pee. She plays with the cock like a cat toy, scratching and biting while eagerly servicing it.