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...
With Mizushima-senpai after us, 
we can't let our guard down.
Como Mizushima-senpai está tras 
nosotras, no podemos bajar la guardia.
Como Mizushima-senpai va a por nosotras, 
no podemos bajar la guardia.
Depuis que Mizushima
 m’a prise pour cible,
Com a Mizushima-senpai atrás de
 nós, não podemos nos descuidar.