Who Isn't Sleeping?.With her parents away for the night, Aya invites the other girls over for a sleepover, during which she ends up smacking away Yoko when she tries to touch her hair. Lacking the confidence to apologise to Yoko, Aya asks Karen to let her become her pupil so she can learn her energetic traits, but these don't suit her at all. After working up the courage to apologise, Yoko states she didn't think anything of the incident and buys some matching notebooks. Later, the girls play hide-and-seek in the school.