After reading all of the books that Grandma left him, the narrator divides the spells into "three categories" : harmful spells, "beneficial spells" , and "support" . After sorting through the books, he finds a jar covered in layers of gu, a kind of insect-like substance. He opens the jar and sees that the gu has been "fed" with blood from its host for fourteen days. He doesn't really need protection, but he wants to see what the gu looks like when it is born. The narrator compares himself to the bug, saying that he and the bug are "nothing alike" and that they are "beautiful little fools" who only know how to play with the bug. He goes on to say that the bug is picky about food, so he's ready to form its own cocoon.