How long has it been...? Since her homeroom teacher deprived her of her virginity, Yayoi has been called up almost every day and in various places at the school, so Yayoi have been a mess. However, Yayoi's reasoning has not been lost. Her unwavering feelings for her brother Ryousuke have supported her. Ryousuke is worried about Yayoi, and at lunchtime presents a gift for her. Yayoi immediately attaches the the pink ribbon given to her. Ryousuke smiles at Yayoi who looks happy. However, the tranquillity is torn away by the ringtone of a telephone.
