While Kazuya desperately tries to get Ruka to promise she won't reveal his secret, she tells him her own.
She had this serious look on her face.
كانت ملامحها جادة
Sie hatte ’nen echt ziemlich ernsten Blick drauf.
Aveva una faccia seria...
Tava com uma cara séria...
Будто решила чего-то добиться.