Sunset Dragons are closely related to sunrise dragons. However, their behaviors differ greatly. Sunset Dragons generally live alone or in small packs. They are more active in the evening, hunting and performing all of their daily tasks as the sun sets.

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.

Miss Iriai San is Miss Dawn San's cousin. However the two do not get along well. While Dawn is a socialite amongst dragons, Miss Iriai would prefer hunting down her meals during the evening when Miss Dawn is asleep and quiet for once. Her name means "sunset" in Japanese. Lastly due to being nocturnal, she doesn't like visitors during the day, but she might let a few visitors in before sunrise.