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 don't think we left any evidence.
No creí que dejáramos evidencia.
No creo que dejáramos pruebas.
Je ne pense pas avoir
 laissé de traces, mais…
Eu não acho que deixamos evidências.