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...
Your voice is too damn high! How 
high'd you make your voice thing?!
¡Tu voz es demasiado aguda! ¡¿Por 
qué tienes que exagerarlo tanto?!
¡Tu voz es demasiado aguda! ¡¿Por 
qué tienes que exagerarlo tanto?!
Sua voz está muito alta! Você não
 está escutando a própria voz?!