A sex research circle said to exist at a certain university. The only female member is the cutest girl in the biology department. She is actively working on her research every day! Her assignment is to apply and verify all kinds of stimulation to the male organ. She doesn't hesitate to offer her own petite body. She provides close-up footage of the most important parts as data. Challenging various perverted positions and continuous forced orgasms, she touches human sexual instincts under an abnormal orgy and reaches the abyss of pleasure!
