One day, a gifted graduate student in Saitama University's science department, Himuro Ayame, confesses her feelings to Yukimura Shinya. However, as neither of them have any experience with romance, they are worried as to whether it truly is love or not. They decide to discover "the standard conditions of love" so that they can judge each other's feelings by them. Even as their underclassman in the lab, Kanade, throws up her hands in exasperation, Yukimura and Himuro attempt to quantitatively measure "thrilling palpitations of love" by taking their heart rates while performing actions such as "kabedon," "chin-lift," and "sleeve-roll," but...
but as the number of trials progressed, 
that increase started to diminish gradually.
لكن بعدما تزايد عدد التجارب، بدأت تلك
 .النسبة في الانخفاض
Aber mit steigender Zahl der Durchgänge
nahm die Wirksamkeit kontinuierlich ab.
pero al continuar las pruebas,
el incremento empezó a disminuir.
pero al continuar las pruebas,
el incremento empezó a disminuir.
Mais au fur et à mesure
des répétitions,
ma più le prove andavano avanti,
più quell'aumento iniziava a diminuire gradualmente.
mas, conforme progredíamos,
a aceleração diminuiu gradualmente.
Однако с увеличением количества попыток 
частота пульса постепенно снижалась.