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".
Because we're Hand Shakers, young man.
لأنّنا مُتصافِحان أيُّها الصّغير
Na, weil wir Handshaker sind.
Porque somos Hand Shakers, chico.
Porque somos Hand Shakers, chico.
Perché noi siamo Hand Shaker....
Porque somos Hand Shakers, jovenzinho.