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...
Well, she doesn't seem like 
such a bad teacher, I suppose.
Bueno, no parece ser una mala profesora.
Bueno, no parece ser una mala profesora.
Bem, acho que ela não parece
 ser uma professora tão ruim.