Is the boobs on top right Komaki or Kasumi ?

Seika said:

Is the boobs on top right Komaki or Kasumi ?

It seems to be Kasumi. She has significantly longer hair than Komaki does and the braids that rest on her breast are tied with white ties. Kasumi's breasts are also somewhat larger than Komaki's.

On a side note, it's somewhat hard to tell whether Yumi, Hisa and Sumire have already been genderswapped in the lower right hand corner, since Yumi's suit looks very much like her school uniform, and Sumire seems to wear a blazer and necktie for her winter uniform.