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...
It means they don't think you 
would do anything that low, right?
Eso significa que no creen 
que serías capaz de eso, ¿no crees?
Eso significaría que no creen que 
fueras capaz de eso, ¿no crees?
Ça veut dire qu’elles ne te croient pas
 sournoise à ce point.
Isso quer dizer que eles nem imaginam 
você aprontando essas coisas.