The ones harassing Riko and her friends were "former" student council president Enomoto Yuiko (Eno), whose work was stolen by Maki, and her friend and student council treasurer Mizushima Sayori (Sayo). Declaring war on Riko and her friends, Eno and Sayo sneak into the student council room where they discover materials related to the love lab.
Meanwhile, Maki takes on all the responsibilities of the student council herself and collapses from the strain...
I've never had so much fun 
with another person before.
Es la primera vez que me divierto 
tanto con alguien más.
Es la primera vez que me divierto 
tanto con otra persona.
C’est la première fois que
 je m’amuse autant avec des copines.
Eu nunca me diverti tanto com outras pessoas.