she can only graduate once Sou has found the right girl to take care of him while also trying to keep him dependent on her. It is shown that they do have sexual relations with each other. However, it is revealed that the Ai seen so far was nothing more than a hallucination of Sou's mind that had developed after a near death experience. Afterward, Sou pushed his real sister away and they hadn't talking ever since. The real Ai's picture is shown during her funeral after she dies of a brain hemorrhage in volume 9. Instead of the straight hair with long pinned back bangs of Sou's mind, the actual Ai had wavy hair with straight edged bangs. Dream Self: Ai takes the form of a young girl in Gothic Lolita style clothing and is almost always carrying a teddy bear. Wandering the dream world in lace and sometimes blood, she considers herself as the most important to the dream class. She has also proclaimed herself as the strongest dreamer in the class and displays a great deal of power to back it up. Ai takes this form because during her childhood is when she lost and regained Sou, and the teddy bear represents Sou. In the volume nine, she is revealed to be a ghost of sorts, a creation of Sou's mind to compensate for thinking that his real sister had betrayed him when he was young. Although he wishes to get rid of her, it seems Sou lacks the willpower to do so. Secondary characters Nurse A mysterious nurse, whose name is never stated, who takes the students to the basement infirmary so they can take part in a special class on Thursdays. She knows all the new and old students' names and their "issues", like Ichijo's gender. The nurse also takes part in the memory loss when a student "graduates". Though not explicitly stated, the nurse is different for each student and takes the form of the students' mothers. This is hinted as the nurse for Kureha looks different from Ichijo's nurse as well as the fact that Ichijo's nurse looks exactly like Ichijo's mother except with lighter hair. The entrance to the basement infirmary is not accessible except to class members on Thursdays. Midori takes part in the dream class. She was on the Beautification Committee and a straight-A student. As a model student, Midori