Seasonal Dragons take on the characteristics of the season during which they are born. Thus, eggs that are laid in spring match the pink flowers and green buds of spring, and those that are laid in the summer grow to depict the bright green of the forest trees and the yellow of the sun. Eggs laid in autumn display the bright colors of leaves falling from trees, and those that are laid during winter take on the appearance of the icy snow.

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.

His name means "Cold Weather" in Japanese. He is the son of Akihiro and Hanako, and has been best friends with Hiroyuki, Kogoeru, and Sika since they hatched. He is very spirited, and is definitely the "leader" of his friends. He is strong, and smart, and has an innate sense of justice. He often helps to settle disputes, and has a very calm demeanor that makes others listen to him. He is also very kind, and has a good heart. And that's what made Yuki fall in love with him. Yuki is very lighthearted, carefree, and joyous. And that's what first attracted Samui Desu to her. They met at a gathering, and the attraction between them was immediate. They both shyly went up to each other. Afterwards, they decided to start hanging out, and then they fell in love. They started courting, and then, on a wonderful snowy day. Samui Desu asked Yuki to be his mate. She agreed, and they've never been happier. They look forward to spending forever together, and always in love.