Fafner in the Azure: Dead Aggressor
蒼穹のファフナー Dead Aggressor (original)
Tatsumiyajima is the central island in the middle of a small cluster of islands, in a sleepy backwater of the Japanese isles. Not much happens there, and the island's young people go to school knowing that their lives are likely to remain peaceful and undisturbed. Or so they have been taught...but the truth is different. The fate of mankind is on the line, and Tatsumiyajima is the last line of defense against a hostile and incomprehensible enemy. At the center of it all, fighting for Humanity's continued existence, is the giant robot Fafner, the dragon that guards this final treasure of mankind.
Starring Sanae Kobayashi, Kohei Kiyasu, Misato Fukuen, Satomi Arai, Makoto Ishii, Ryoko Shiraishi, Marika Matsumoto, Miyu Matsuki, Minoru Shiraishi, Rio Sasaki
Watch "Fafner in the Azure: Dead Aggressor" on Amazon released in 2004. It's a animation and drama show, and has a rating of 7 out of 10 from Imdb which is usually fine for this kind of show.