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 at this rate, she can't set 
a good example for the students!
pero como van las cosas, no podrá ser 
un buen ejemplo para sus estudiantes!
pero como van las cosas, no podrá ser 
un buen ejemplo para sus estudiantes!
mas desse jeito ela não vai ser 
um bom exemplo aos alunos!