Aria dragons are a brightly-colored and sprightly breed, perhaps most adored for their lyric calls. Their song-like melodies fill the areas they inhabit; their coos resemble those of birds, only more elegant and refined. They have fairly strong magical capabilities, but tend to reserve these strengths for last-minute defense, choosing to live their lives in simple peace. Arias, sticking to the tropics, typically live quite far from human settlements, giving rise to the previously held belief that they had gone extinct.

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.

Ever the romantic, Tsuku loves the idea of fairytale couples drawn together by fate. He's always been especially charmed by the stories of dragons meeting their lifelong mates through simple interactions, such as asking for directions or meeting each other at the local farmers' market. Naturally, of course this means that to find his true love, Tsuku must engineer a way for them to meet. He has thus taken it upon himself to practice his singing every day, taking inspirations from only the most beautiful of birdsong, firmly believing that one day when his song is complete his true love will hear it and find him. In the meantime, he also makes sure to rotate his singing locations regularly, just to make sure he doesn't miss his true love by accident.