Souryuuden
English title: Legend of the Dragon Kings
Japanese title: 創竜伝
Type: OVA
Episodes: 12
Source: Novel
Genres: Drama, Mystery, Supernatural
Studios: Kitty Film Mitaka Studio
Producers: Kitty Films, Kodansha, Fuji TV
Duration: 45 min per ep
Rating: R - 17+ (violence & profanity)

The four Ryudo brothers hold an ancient secret - they are descended from the dragons. They have the speed, strength and power of their legendary ancestors - and they're getting stronger. But when pushed to the limit, they become the terrifying, uncontrollable dragons of mythology. These powers have attracted the attention of some powerful enemies - shadowy organizations with unlimited resources and weapons who will stop at nothing to control the brothers.

(Source: U.S. Manga)