To find proof as to whether he is "in love" or not, Yukimura pats Himuro on the head from point-blank range. Seeing this, Ibarada, an upperclassman in the Ikeda Lab, talks about the need for a control experiment. In other words, in order to prove that the racing of his heart is because of Himuro specifically and not just because he's facing a woman, Yukimura has to pat Kanade and Ibarada on the head too. Himuro, on the other hand, sets out to prove that food made with love tastes better and cooks, but...
We were doing an experiment to find proof 
of whether one party loves another or not.
كنّا نقوم بتجربة لإيجاد دليل على حبّ 
.شخصٍ ما لآخر أم لا
Wir wollen untersuchen, ob einer
von uns beiden Probanden den anderen liebt.
Experimentamos para encontrar
pruebas de enamoramiento.
Experimentamos para encontrar
pruebas de enamoramiento.
On essaie de prouver
que l’un de nous deux est amoureux.
Stiamo cercando delle prove che stabiliscano
se una parte è innamorata dell'altra o no.
Estamos fazendo um experimento
para definir se um ama o outro.
Мы пытаемся доказать, 
что один человек любит другого.