Honor student Kisaragi Sarasa, blessed with both beauty and knowledge, pulls down her mounting cravings and nosebleeds as the day finally arrives. Kira, her younger brother, was accepted into the same school as her, so she invited him to her room to celebrate, intending to kiss him for the first time. He goes in without suspecting anything, not recognizing this. She rushes on him in her see-through negligee and stares him down with her breasts exposed and her eyes full of hunger.