S2·E1 He and a Genius Each Consider a Decision Pertaining to X

Even during summer vacation, Nariyuki and the girls have to study hard at cram school. One day, Rizu gets an abysmal "E" on one of her tests. Depressed, she shares her grade with the other girls, which causes an uproar. That's because they mistakenly think she's telling them her bra size.