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 thought you would stop coming 
if the harassment continued.
Pensé que dejarías de venir 
si el acoso continuaba.
Pensaba que dejarías de 
venir si el acoso continuaba.
J’avais peur que vous arrêtiez de venir au conseil
 si les messages malveillants continuaient.
Eu pensei que vocês parariam de
 vir se as provocações não parassem.