Shu and Jiro
Training under Zola, Shu is eager to prove that he's worthy of being a Shadow wielder, but summoning and controlling the Blue Dragon at will isn't going to be easy. If that wasn't enough, Shu's rivalry with Zola's companion, and fellow Shadow Wielder, Jiro is growing. But the rivalry is put on hold when a Grankingdom assassin sets his sights on Jiro!
Aired 21/04/2007EP 3 - Shu and Jiro

Blue Dragon
As Shu's village was being attacked by an unknown enemy, he and his friends, Jiro and Kluke decide to defend their home. They soon meet warrior Zola and receive the powers of Shadow, an ability that let's them transform their shadow into a powerful monster. Shu receives one of the most powerful monsters, Blue Dragon, and they all set out to defeat their enemy.
(Source: Anime News Network)