Seri and Moe pretend to be super cool and super nice and say Yaya is their friend but those girls are real bitches. I just looks like as if it makes them happy to harrass Yaya, but soon they seems to realize that Yaya's somehow stronger than they thought at the beginning (well, in reality, Yaya is not strong, it's just Nana...). They also try to make Yaya look bad in front of Moriyama-kun.