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...
Onee-san will teach you all 
some up-and-down gymnastics...
Oneesan les enseñará cómo 
deben ejercitarse a diario...
Onee-san os enseñará cómo 
debéis hacer ejercicio a diario...
a Maninha vai ensinar vocês a 
fazer uns exercícios de ginástica...