Cloudsea City(Yunhai City) is very famous in Azure State(Qingzhou) because it is the largest city in Azure State(Qingzhou). Besides, it is also the site of the Cloudsea Academy(Yunhai Academy), the most mysterious force in Azure State(Qingzhou).
Around Yunhai City, there is a mountain range that soars into the clouds. This mountain range is called the Sirius Mountain Range, and inside it is a famous demon king the Sirius Demon King(Heavenly Wolf Demon King).
The Sirius Mountain Range that surrounds Cloudsea City(Yunhai City), and it is not a hostile force but it is not also friendly. It should be said that both sides are using both sides. The Cloudsea Academy(Yunhai Academy) is using the monsters of the Sirius Mountains to train its students, and the Sirius Mountains are also using the students of the Cloudsea Academy(Yunhai Academy) to train their own demon-monsters.