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...
But you made it for your friend, 
right? Onee-san is very moved!
Pero lo hiciste por un amigo, ¿no? 
¡Oneesan está muy conmovida!
Pero lo hiciste por un amigo, ¿no? 
¡Onee-san está muy conmovida!
Mas você construiu para o seu amigo,
 não foi? A Maninha está comovida!