Warset
In a seclusive kingdom that rarely allows foreigners and others to visit, also one of the most influential kingdoms in the whole world, there was chaos in the palace.
The kingdom was ruled by a powerful king alongside his several queens. There were abundant children in the palace and most of them were talented and geniuses.
In Warset the spiritual energy was much higher than in other worlds, so the lowest realm that you can find will be probably martial disciple. Everyone was very powerful there and it wasn't a joke.
And their lifespan was much higher than other worlds as well. Among the children of this famous king who loves beauty and kept on increasing his harem all the time, there was one particular child whom the king really loves.