Seki-kun starts playing Go on his desk. Yokoi-san tries to ignore this since she doesn't know the rules, but this yet again turns into something rather unexpected.
How can you make that with 
such a serious look on your face?
Wie kannst du so ernsthaft aussehen,
 wenn du so etwas machst?
C’est ça que tu fais 
avec un air si sérieux ?
Come fai ad essere così serio mentre 
fai una cosa del genere?
Como você me faz uma coisa
dessas com essa cara séria?