The bond between sisters blossoms into love. Kourin and Wasabi, two maids harboring hidden passions, are drawn into a forbidden relationship. Wasabi holds a secret between her legs—a penis that intensifies her deepest feelings. One day, unable to suppress her love for her older sister, Wasabi surrenders herself to Kourin. Yet Kourin, too, has long cherished the same desire. Their passion meets in a secret room, where fierce yet tender moans echo through the air. As love and lust intertwine, the truth of their relationship is finally revealed.