The summer heat is on!
Koizumi-san looks at the trio loudly suffering from the heat with disdain while she continues on her ramen pilgrimage. 
Yuu wills herself to follow her, and Koizumi-san declares that she will be having "hiyashi" ramen.
What exactly is this "hiyashi" ramen?
Also, you seem to have the wrong idea.
Ihr scheint außerdem einem
Missverständnis zu unterliegen.
Et puis,
vous semblez vous méprendre.