When Water Dragons mature, they lose the ability to survive on land, entering the water permanently. They are adept swimmers and eat whatever fish are in the lake they live in. They tend to inhabit the same lake for their entire lives, although a few live in the ocean and swim all over the world.

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.

Achimes lives in the wide sea, listening to the voice of the sea god, which can't be heard by humans, and living after the rules it is preaching.<br/>He had chosen the wide sea due to the freedom it provides. With fast and well-aimed movements, he hunts after seals, sharks and other bigger sea animals.<br/>Once in a while he returns to the shore near its owner Yousei's place, with a tasty fish as a present, thankful for the good care it got when it was a hatchling.