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".
By the way, weren't you saying 
something in the car, Senpai?
بالمناسبة، ألم تكوني تقولين شيئاً في السيّارة يا سينباي؟
Ach ja, wolltest du vorhin
im Auto nicht etwas sagen?
Por cierto, ¿qué ibas a decir
antes en el coche?
Por cierto, ¿qué ibas a decir
antes en el coche?
Au fait, vous avez pas marmonné
un truc dans la voiture ?
A proposito, senpai, poco fa in macchina 
non stava dicendo qualcosa?
Por sinal, o que você estava
 falando no carro, Senpai?