While Kazuya desperately tries to get Ruka to promise she won't reveal his secret, she tells him her own.
which reduces the chances of 
him finding out about us.
فيضعف احتمال اكتشاف أمرنا
was das Risiko minimiert,
dass das mit uns auffliegt.
Il apprendra sans doute pas
la vérité sur nous.
e, forse, questo ha fatto diminuire 
le possibilità di essere scoperti...
aí diminui a chance dele
descobrir sobre a gente.