At the Okinawa training camp, Yukimura and Himuro shared a kiss of the highest theoretical value on a bridge of the greatest mood value under the beautiful, painterly rays of the morning sun. But the amount of saliva they collected was insufficient and so retesting is required. They head to the biological sciences' Regulation of Biological Systems Department to meet with a specialist in saliva testing. There, they find an alluring woman dressed like a traditional courtesan wearing a lab coat, Suiu, and her sweetheart, Chris. When Yukimura asks Suiu and Chris to help with their experiment to "give proof of love," Chris and Suiu flaunt their overwhelming aura of love.
We are conducting an experiment to 
clarify the nature of "romantic love."
."نقوم بإجراء تجربة لإيضاح طبيعة "الحبّ الرومنسيّ
Wir führen ein Experiment durch,
um die „Verliebtheit“ zu definieren.
Nuestra investigación busca dilucidar 
la naturaleza del amor romántico
Nuestra investigación busca dilucidar
la naturaleza del amor romántico
Nous étudions les sentiments amoureux
pour découvrir une définition à l’amour.
Stiamo conducendo un esperimento
per chiarire la natura dell'"amore".
Estamos fazendo um estudo para
explicar o "amor romântico".
Мы проводим исследование
с целью определения природы «любви».