Kiryuu are a subspecies of dragons capable of flight. It’s supposedly a kind, reliable, expensive species. They are a combination of a pure dragon and some other, weaker species. Because of this they are not as strong as a pure dragon, but the ability to fly makes it useful if domesticated. Most Kiryuu are only able to carry one passenger at a time and cannot carry much cargo. They are somewhat common in Melromarc under the control of knights. Because training a flying dragon is difficult, people who accomplish it are called Dragon Knights. Found in 『Chapter 24』 of the web novel.