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...
but you haven't looked like that 
since you became a member.
pero desde que te hiciste 
miembro, ya no la tienes.
pero desde que te hiciste 
miembro, ya no la tienes.
mais ce n’est plus le cas depuis
 que tu es membre du conseil.
mas desde que entrou no 
conselho, não parece mais.