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."
you have caused her great sadness 
up to this point, haven't you?
سببت لها حزنا عظيما حتى هذه اللحظة، أليس كذلك؟
verletzt du sie bisher immer wieder, klar?
hai accresciuto la sua tristezza
fino a questo punto, no?
...você a tem feito sofrer, não é?
ты очень сильно её расстраивал,
верно?