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'll mix this into the materials 
for tomorrow's meeting,
mezclaré esto en los materiales 
para la reunión de mañana
mezclaré esto en los materiales 
para la reunión de mañana
eu vou colocar isso nos materiais 
da reunião de amanhã,