Aya Inami gets caught up in an abnormal experiment at graduate school. Under the guise of molecular biology, her professor forces her to masturbate while bombarding her with vulgar questions about her first sexual experience, menstruation, and more. Unable to comprehend the situation, she ends up having sex with a teaching assistant—culminating in a creampie. Enduring it all as part of the experiment, Aya ultimately finds herself in creampie sex with the professor himself. Soon forgetting the pretense of research, she becomes overwhelmed by sensation, her beautiful appearance contrasting sharply with the lewd treatment she endures.