The Sket-dan is roped into helping with Onee-san's ex-kid's show's stage performance, but they never would have thought it'd turn into a race against time to bring smiles to children's faces and prevent severe bodily harm to themselves!
to concentrate a sunbeam coming 
in through the window...
para concentrar los rayos de sol que se filtran por la ventana...
para concentrar los rayos de sol que se filtran por la ventana...
para concentrar a luz solar da janela...