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...
So Onee-san wants everyone to 
come at her with all you've got!
¡Es por eso que Oneesan también 
quiere que den lo máximo!
¡Es por eso que Onee-san también 
quiere que deis lo máximo!
Então a Maninha quer que vocês
 venham com tudo com o que têm!