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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)

Wakamatsu Masato lives with his step-sister, Miyuki, whom he does not have blood relationship with. Their father is always working oversea and left the two of them living by themselves in Toukyou. Miyuki is cute, nice, sensitive and very popular among guys around Masato. Masato has a girlfriend at school whose name is Kajima Miyuki, who is pretty and gentle, the ideal dream of every highschool boy. (Source: AnimeNfo)