The Sket-dan get a new assistant homeroom teacher (who wants everyone to call her, Onee-san), but she's a klutz and is upset she can't be a good role model for the students, so the Sket-dan ask Chuu-san to help with some of his strange drugs. Later, Switch goes through some old inventions of his that didn't work out as intended...
The head-only thing is creepin' 
me out. Let's get rid of it.
Que sea sólo una cabeza es muy 
desagradable. Será mejor tirarla.
Que sea sólo una cabeza es muy 
desagradable. Será mejor tirarla.
Estou com medo dessa coisa que é só
 uma cabeça. Vamos nos livrar dela.