The Paizuri Research Institute is a perverted and obscene organization that studies the breasts of big-breasted beautiful girls from all over the country! The subject of this research is Tomoko Kamisaka, a girl with I-cup breasts. Her sensitive breasts are squeezed and kneaded over her uniform, and Tomoko's cute sighs make her breasts even more sensitive. They massage her breasts with oil to make them suitable for paizuri. They press her squishy breasts against an acrylic plate to study how they deform and crush, observe how wet her pussy gets while she gives them a paizuri with a dildo, and study paizuri with the researchers' dicks. Her semen-covered big breasts are washed with a foam body wash over her school swimsuit to heighten her lust. And for the final research, they use the dicks of several researchers to invade her big breasts and pussy in a paizuri frenzy. Tomoko, a big-breasted beautiful girl, goes crazy as she is showered with the researchers' semen on her big breasts.