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...
They look like they're having 
so much fun, flying around...
Parecen divertirse, volando por ahí...
Parecen divertirse, volando por ahí...
Elas parecem estar se divertindo 
tanto voando por aí...