Despite her petite and delicate appearance, Sumire is a woman who enjoys men. However, her standards for choosing men are extremely strict, revealing her to be a surprisingly strong-willed and serious person. After a major mistake in the past drastically changed her life, she now struggles with insecurities about opening up to others. Yet, she's driven by a desire to fully let go and enjoy wild sex. With these inner changes and heartfelt emotions, she's taking a bold new step forward.