Yokoi-san gets closer to Seki-kun as he's trying out glasses in class. She starts to think that the glasses are so he can see during class... but that leads to a huge misunderstanding!
So I guess Seki-kun cares about how he looks.
Er ist also jemand, der sich über
 sein Äußeres Gedanken macht.
No sabía que a Seki-kun le 
preocupaba la apariencia.
No sabía que a Seki-kun le 
preocupase tanto su aspecto.
Je n’imaginais pas Seki
aussi soucieux de son apparence.
Quindi Seki-kun è interessato all'aspetto.
Então o Seki se preocupa com a aparência.