Synopsis：Honor student Kisaragi Sarasa, blessed with beauty and intelligence, awakens each day with a swelling desire and a nosebleed that refuses to subside. Her younger brother Kira is admitted to the same school, and to celebrate, she invites him to her room, ready to give herself to him for the first time. Unaware of her intentions, he suspects nothing. Dressed in a sheer negligee, she pounces on him, gazing with eyes full of lust and breasts.