Blue Dragon: The Seven Dragons of the Heavens

After the events of the Blue Dragon series, Shu and Bouquet join a resistance group to fight General Rogi's army of invasion.They encounter a mysterious child , Noi, who has the power to revive Shu's shadow counter-part Blue Dragon, and save her from the pursuit of a red dragon. Now Shu and his company have to set foot once again on a journey to discover the purpose of the dragons, undergo their tests and stop the chains of events which threatens the fate of humanity. (Source: ANN)

AnimesHUB is the best site to watch One Piece SUB online, or you can even watch One Piece DUB in HD quality. You can also find Toei Animation anime on AnimesHUB website.