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".
Even if our fight's over, 
I still think that's true.
حتّى ولو انتهت معركتنا، ما زلتُ أؤمن
بإمكانيّة تحقيق ذلك
Auch nach dem Kampf denke ich das.
Aunque ya no peleemos,
eso no ha cambiado.
Aunque ya no peleemos,
eso no ha cambiado.
Ça ne changera pas
même si notre combat est terminé.
Anche se la battaglia per noi è finita,
la penso ancora così!
Mesmo que nossa luta tenha acabado,
 ainda acho que seja verdade.