By chance, Azusa stumbles upon the "Married Life Improvement Research Society," and before she realizes it, she is drawn into their skillful seduction and training. As a woman who has never known the pleasures of sex, she falls into a state of depravity—dominated by pleasure and betraying her beloved husband—experiencing intense sexual arousal from her guilt, while simultaneously struggling with self-reproach. Gradually, she sinks deeper into ecstasy. Throughout this process, her tormented figure wavers between self-denial and pleasure.