Seki-kun starts shining his desk during class. Amazed at the effect of his work, Yokoi-san finds herself being dragged into his want to shine more desks.
Right... let's do the back, too.
Genau... die Rückseite auch.
Bien, también lustra la parte de atrás.
Bien, saca brillo también a la parte de atrás.
Bravo. 
Ora anche il retro.
Certo... A parte de trás também.