Arata, once and for all, tries to make the dense-as-can-be Kazuomi realize what he has in his hands.
Just 'cause you're young, 
don't take the heat lightly.
.لا تستهيني بالحرّ فقط لأنّك شابّة
Nicht so leichtfertig bei dieser Hitze,
auch wenn ihr jung seid!
La chaleur affecte aussi les jeunes.
non sottovalutare il caldo
solo perché sei giovane, okay?
Não subestimem o calor 
só porque são jovens.
Не забывай о жаре, раз молодая.