Kaname is worried about never seeing Mary with friends from her class.; Mastushita assumes she has lots of friends.  But what does Mary think?
Kaname-kun and Yuta-kun 
are in Class 4...
Kaname-kun y Yuta-kun 
están en el salón 4...
Kaname-kun y Yuta-kun 
están en la clase 4...
O Kaname e o Yuta estão na turma 4...