Yukimura is working hard on his computer, as usual, when Himuro suddenly says, "I am in love with you. Her confession greatly shakes Yukimura. Unlike the last time, Himuro states her feelings matter-of-factly. Yukimura asks, "What theory did you use to determine that you love me?" Himuro replies by taking Yukimura out on a date and begins performing experiments they've done before such as measuring heart rates, using an emotion counter, collecting saliva, and the kiss experiment.
After all, since that day you two 
began your romance research together,
بعد كل شيء، منذ اليوم الذي بدأتما فيه 
،بحث الرومنسية خاصتكما مع بعض
Seit ihr gemeinsam mit eurer
Liebesforschung begonnen habt,
Después de todo,
desde que empezaron su investigación
Después de todo,
desde que empezasteis la investigación
Je suis leurs recherches
depuis le premier jour.
Dopotutto, dal giorno in cui avete iniziato
insieme la vostra ricerca sull'amore,
Afinal, desde o dia em que começaram
a pesquisar sobre o amor,
Ведь с того дня, когда вы начали
своё исследование любви,