Heartstealing Dragons are an unusual breed, named for their mating rituals. These dragons use their long, slender bodies to sneak into both human and dragon holds to steal things over the year. Then, when the right season hits, they give away their entire hoard as gifts, leaving things in the homes of other dragons to attract them. When these gifts are found, however, the recipients can’t always tell who gave the gifts. This receiver often assumes the source of the gift was the original owner, causing them to form friendly bonds with other dragons in the area, spreading peace—and sometimes even sparking love. The only way to know if a gift is from a Heartstealing Dragon is to find one of their wafer-thin scales at the scene.

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.

True to her breed, Koibumi steals items from other dragons during the year and gives the hoard away when she feels the season is right. However, Koibumi is somewhat picky about the things she filches; she only takes books, scrolls, or other manuscripts that she can slip love letters into for the receiver to find when the items are redistributed. This has made her responsible for some of the romances that have blossomed between quieter, studious dragons who prefer to keep to themselves. When she's not adding to her current hoard, Koibumi makes sure to keep herself well-read in regards to romantic poetry and prose. Sometimes, a newly-formed couple will loan her a book of such topics, as thanks for her efforts.