The other aono kun chapter 4 opens with a flashback to the previous chapter, in which a girl named Horie is absent from school. The girl's name is "San," and her class is called "San's Class." Every Thursday, the girls in the class go to her house and work on her homework. When the girl is not home, the students take turns going to the house to work on the homework for the girl. The teacher asks the girl if she likes the work, and the girl says that she does, but that she doesn't like horror movies. She says that when a killer comes after you, you shouldn't go upstairs, because there are monsters in sinks and beds. She also says that some people say that if you like a horror movie, you should like to murder people, but this is not the case at all. She goes on to say that the title of the movie was "Ghosts," and that the girl in the story wondered if ghosts could enter her body. The boy in the movie made her declare that she wanted to try him, and when he did, she was shocked to find out that he was actually a ghost.