Minoru lives with a woman he believes is his mother, while secretly pursuing a relationship with a mysterious woman named Akane. After engaging in sexual encounters with both, Minoru discovers a shocking truth: the woman raising him is actually his aunt, and Akane is his biological mother. Driven by this revelation, Minoru descends into a taboo relationship with his true parent.
Minoru continues his illicit sexual encounters with Yuko and Tomoe, even enduring a humiliating ordeal during a school meeting. Amidst the pleasure and coercion, a shocking family secret is revealed: Minoru is not biologically related to the women raising him, having been born via a surrogate mother after the death of his biological parents. This revelation deepens the complex, taboo dynamics as Minoru descends further into a cycle of lust and manipulation.