Kotoko gets nervous when Naoki refuses to sign the marriage registration forms and doesn't come home for a while.
Why haven’t you registered
your marriage?
Was ist dein Problem? Warum hast du
eure Hochzeit noch nicht registriert?
¿Por qué no han registrado su matrimonio?
¿Por qué no habéis registrado vuestro matrimonio?
Pourquoi ?
Por que você ainda não 
registrou o seu casamento?