They had no idea where it had come from, but a handcuff ring had fallen a short distance away, just like before.

No, that was not all.

Unlike before, there was something like a bicycle gear with it.

With a deafening metallic noise, a chain shot from the both heads and formed humanoid skeletons.

One was a chain meant to bind something to prevent movement.

The other was a chain meant to carry some kind of force to accelerate movement.

They were both chains, but their essences were different.

“Those symbolic weapons have no original role! View the gear as the sun and it symbolizes the male. View the handcuff as a ring and it symbolizes the female. That symmetry is being used to draw out a nonexistent element!”

Toaru Majutsu no Index New Testament vol.18 ch.2 pt.2