Reiko is Nao’s smart and popular classmate who is the ringleader of the gang of kids that bullies Nao. Though Reiko rarely does any of the bullying herself, she is the one who usually plans it. Nao says that Reiko looks at her as if Nao were “something loathsome or half dead,” and Nao hates her. When Nao’s classmates corner her in the bathroom to try to rape her, Reiko seems to be the one who planned the whole thing.