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...
How can one prove that it 
has become more delicious?
كيف يمكن إثبات كونه أصبح ألذّ؟
Wie kann man beweisen,
dass es tatsächlich besser schmeckt?
¿Cómo podemos probar que será mejor?
¿Cómo podemos probar que es mejor?
Comment prouver qu’un plat
est devenu meilleur ?
Come si può provare che sia diventato più buono?
Como podemos provar
que ficou gostoso?
Как доказать, что блюдо стало вкуснее?