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 made a lunch for her little 
brother, and she kinda mixed them up...
Oneesan hizo el almuerzo para su hermanito, 
pero parece que se cruzaron...
Onee-san hizo el almuerzo para su hermanito, 
pero parece que me llevé el que no era...
A Maninha fez o almoço para o irmão dela,
 mas acabou misturando os dois...