The chapter opens with a conversation between Yuki and Sepai. Sepai asks Yuki what he is reading, and Yuki tells him that he is addicted to a book called "Yaoi books." Sepai says that the author is famous for his research on ufos, or "ufos in the sky," and that his books are called "yaoi books" because they are written in the language of the ufo. Yuki asks Sepai why they should go on a ufo watching expedition, and he says that it will be fun, and that they will need some equipment to do so. He tells Sepai that he wants to invite Hanai for help, but that he will not listen to him again. He says that he heard that Tsumugi wants to attend the same school as Hanai, and so they should invite him for help. Hanai says that they should not run in the halls, because it is a sin to hide a secret, and they should hide it with their own eyes. He then tells them that they need to sneak in and see what is going on in the room, because the room is full of sin.