Black Dragons are warriors. They are strong and capable in battles of force, but also ample magic users, capable of devastating opponents with their spells. Their bright eyes give them excellent night vision, which is why they generally hunt during the night.

Dragons are highly-intelligent reptilian creatures that—from a human perspective, at least—appear to live forever. Many different varieties of dragon exist, each with their own unique qualities, habitats, and behavior. Adolescence in dragons is usually marked by the growth of a hatchling’s wings, although not all breeds of dragons grow wings and some breeds have other traits that indicate the beginning of maturation. In Galsreim, dragons and humans coexist peacefully.

Kurokusuru Hitotsu is the leader of the friendly four club of dragons. The friendly four as they are known when seen together are a group of dragons dedicated to making the world a better place starting with their clan. Kurokusuru Hitotsu being the leader has the privilege and obligation as leader to decide what they are going to do to make the world and their clan a better place. It is not a privilege he takes lightly. Therefore he is a bit of a stick in the mud when it comes to doing something fun. Nevertheless he is the leader and they couldn't do without him.