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".
The other is when a pair of 
Hand Shakers holding hands
الطريقة الأخرى هي عندما يركّز زوجان من المُتصافحَين
Die andere Methode ist, wenn Handshaker,
die die Hände halten,
La otra forma es que una pareja
se tome de la mano
La otra forma es
que una pareja se dé la mano
Si vous vous serrez la main
avec l’envie de combattre,
L'altra possibilità
O outro é quando um par de
 Hand Shakers se dá as mãos,