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".
That was because she shielded Break Chain,
،كان ذلك لأنّها حمَت الجنزير بريك
Das war, weil sie
Break Chain blockte
Eso pasó porque te contuviste
cuando la chica cubrió a Break Chain.
Eso pasó porque te contuviste
cuando la chica cubrió a Break Chain.
Foi porque ela defendeu o Break Chain