The principal adores his grandson very much and asks the Sket-dan to prepare a picture play to entertain him. They decide to base the story off of Momotaro, but change things up from the usual... Afterwards, he asks them to play with his grandson for an afternoon, but the kid doesn't seem interested in having fun at all.
That's what you said before 
you beat up that monkey.
Eso fue lo que dijiste 
antes de golpear al mono.
Eso fue lo que dijiste 
antes de pegar al mono.
Você disse a mesma coisa logo antes 
de dar uma surra naquele macaco.