Demon Mountain is a place inhabited by many demons since long ago, even older than humanity.
This ancient spiritual peak, steeper and more majestic than Mount Fuji, serves as an important balance point in Fantasy Land. Furthermore, the demons within the mountain and the people of Fantasy Land, and even other demons, lead independent societies with unimaginable technique power.
——Tengu are adept at photography, printing, and publishing technology.
——Kappa excel in steel, construction, and tool-making technology.
There are rumors in the Human World that the inside of the mountain is a large cave, where the Tengu and Kappa have their factories, and with just one day's sunlight, they can automatically produce various materials. The demons only need to drink, read newspapers, and chat to enjoy a rich near-future life with advanced technology.
These rumors are somewhat true and somewhat false.
Some parts hit the mark, while others are not quite accurate.
