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 think Eno makes a better 
president than Maki.
Creo que Eno sería una 
mejor presidenta que Maki.
Creo que Eno sería mejor 
presidenta que Maki.
Comme présidente,
 je préfère Eno à Maki.
Eu acho que a Eno seria uma
 melhor presidente que a Maki.