Though Yukimura and Himuro went as far as to kiss for the experiment, they were soundly beaten by Chris and Suiu's oxytocin levels in their saliva. Panicked, Yukimura suggests that they conduct control experiments. However, in the midst of the Yukimura/Suiu pairing, Suiu's seductive manner ends up causing Yukimura to ogle her charms. Seeing that, Himuro runs another experiment with Yukimura, but ends up sulking. The two end up having a lover's quarrel. Yukimura's behavior causes Chris to look down at him coldly and say, "As a man, you are a failure."
They say that there are 
two stages to romance.
.يقال أنّ هنالك مرحلتان للرومنسية
Demzufolge gibt es zwei Stadien
innerhalb einer Liebesbeziehung.
Dicen que el amor romántico
tiene dos etapas.
Dicen que el amor romántico
tiene dos etapas.
L’amour possède
deux phases distinctes.
Si dice che l'amore sia costituito da due fasi.
Dizem que existem dois estágios
num romance.
Согласно данной теории,
в любви есть два периода.