Even during summer vacation, Nariyuki and the girls have to study hard at cram school. One day, they get the results of a mock exam back and Rizu gets an abysmal grade “E.” Depressed, she shares her grade with the other girls, which causes an uproar.... Although that’s because they mistakenly think she’s telling them her bra size for some reason, more confusion follows as Rizu has the mistaken notion that Nariyuki is interested in her chest...
　Days later, Nariyuki and the girls go to a summer session cram school camp. After studying, Nariyuki goes to take a bath when he encounters Fumino and the others in the men’s section! And then more boys come in!!