Humans used copper, silver, gold coins as their currency.

Angels are special beings that work besides G.o.d and only the most loyal and trustworthy Angels can get to see G.o.d himself.

Angels are stronger than any other being in the world but they also live in a place call Heaven.

Jack is one of those Angels but he was G.o.d's favorite and G.o.d treated him like a son himself so in other words he was one of G.o.d's children.

Jack had a skin as pure and white as the snow, Jack had beautiful white wings in his back, Jack had gorgeous blue eyes like the beautiful sea, Jack also had a beautiful soft and white hair, Jack was also the most beautiful angel in Heaven.

White represents good or light and Black represents bad or Darkness

Jack is on the Kanzuki empire.

This is a world of swords and magic.

There will be another story related to TDA:O soon.