Akitsu-Kō

The 9th Hierarchical City of Akitsu-Kō is situated in Russia and is the birthplace of Trinity Glassfille.

Being the 9th Hierarchical City means that Akitsu-Kō is most likely bigger than Kagutsuchi.

The Librarium Branch in Akitsu-Kō was destroyed byRagna the Bloodedge. This is later shown to have a startling effect on the ecosystem as the weather control enforced by the Librarium ceases to function.The Cauldron that was placed here was being used for smelting. Ever since its destruction, the weather control system had become nonoperational. It was resuscitated by Relius Clover