This film tells the story of a mother and son. The son, Masaru, moves in with his aunt due to adult circumstances, but within this new environment, his heart undergoes a profound transformation. Drawn to his mother's presence, he begins to develop feelings unlike anything before. Even after she gains 15 kilograms, he remains captivated by her beauty. His romantic emotions shift in an unexpected direction—toward her. This narrative explores his inner conflict through his evolving relationship with his voluptuous mother, who is entering a rich and transitional phase of life. Witness how the son's forbidden desire is awakened and gradually grows. Enjoy this intense tale of incestuous longing.