Magic City of Ishana

Ishana', or 'The City of Magic, is the magic capital in the world. It is also one of the settings in XBlaze: Code Embryo as well as the Phase Shift Novels.

Phase Shift 1.
Ishana is the main setting of Phase Shift 1. It is here that Kazuma 'accidentally' ran into Yuki Terumi, setting the stage for Terumi to take over Kazuma's body.

Phase Shift 4.
After the fall of Take-Mikazuchi, Ishana and the Ten Saints finally acknowledge the threat that the Black Beast poses and prepare a counter assault led by the Six Heroes

XBlaze: Code Embryo
Ishana is the home to the Magic School and  Research Institute Seven of the Mitsurugi Sector's Neo Yokosaki Branch.

Dark War
Ishana served as the last safe haven on earth during the Dark War. It is home to the Magic Guild and the Ten Saints. It is also the place where the Nox Nyctores, Ars Magus, and Ars Armagus were created and served as the battlefield for the final battle against the Black Beast.