After the battle inside the Ziggurat, Chizuru and Hayate are horrified to find out that their victory would have cost Koyori her life. They agree to help Tazuna and Koyori, even though they're out of the fight now.  They tell the two of them that in order not to be found in the real world, they need to come up with a name to use inside the Ziggurat when they fight.  After a bit of thought, Tazuna and Koyori's new name becomes "Single Gear".
There's no need for it 
to bother you, or Koyori-chan.
لا داعي لتنهمك في التفكير بالأمر أنت أو كويوري-تشان
Darüber müsst ihr euch
keine Gedanken machen.
Ustedes dos no deben
preocuparse por eso.
Vosotros dos
no debéis preocuparos por eso.
Vous n’avez aucune raison
de vous sentir mal.
Sia tu che Koyori
Isso não precisa te incomodar,
 nem incomodar a Koyori-chan.