While Kazuya desperately tries to get Ruka to promise she won't reveal his secret, she tells him her own.
No way. Who knows what you'd 
do if I left you two alone?
كلا، من يعلم ماذا ستفعلين
إذا تركتكما بمفردكما؟
Vergiss es. Wer weiß, was ihr allein so treibt.
Nem pensar. Sei lá o que farão
se ficarem sozinhos.