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".
I will be a guardian you can count on.
سأكون وصيّة يمكنكما الاعتماد عليها
Ich werde zu eurem
verlässlichen Schirmherrn werden.
Yo seré su mentora modélica.
Yo seré su mentora modélica.
Non, tu vas faire de la figuration.
Io vi farò da affidabile tutrice.
Serei uma guardiã que você pode confiar.