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 they realized I'd been 
the one harassing them.
Pero se dieron cuenta de que 
yo era la que las acosaba.
Pero se dieron cuenta de que 
era yo la que las acosaba.
Elles s’étaient aperçues
 que les messages venaient de moi.
Mas, elas perceberam que eu estava brincando.