I recognize this city.
One of the Three Great Towns of the Magic Continent.
A crater-shaped natural wall prevents magic beasts from entering.
After nightfall, magic stones inside the crater illuminates the city.
I know the castle as well.
This was once the seat of the Great Demon Emperor Kishirika Kishirisu, destroyed in Laplace's war with the Demon Kings.
Once known as Old Kishirisu Castle.
Also, for me, a place of unhappy memories.
Rikarisu Town.