This is a pretty long series, I have it spread over 6 2 hours videos (there are 12 "Chapters" in all, around an hour each). It follows the four Ryudo brothers who suddenly find themselves targets for kidnappings, assaults and threats, they wonder what's going on until they hear a legend of four dragon brothers of the Gyu clan.. are they their descendents? A big bad corporation thinks they are and is determined to reveal their dragon powers and use them for their own means, the series follows the brothers as they struggle to deal with their powers and keep themselves and their friends safe from their enemies. It's a great series up until the last scene which is kinda silly, but it doesn't really spoil things. The animation isn't very good, but it *is* a pretty old anime so don't hold that against it. The dragons look good.
Worth watching for any anime fan of a n00b to the genre - this was the first anime I ever saw and It got me hooked!