The Vision of Escaflowne - Season 1 Episode 2 The Girl From the Mystic Moon

In a shaft of light, Hitomi and the prince Van tranports to the world of Gaea, where Earth is known only as the "Mystic Moon" in the nightly expanse. Van returns to the capital of his country Fanelia to be coronated after obtaining the Energist crystal from the dragon. During the coronation rite, the Zaibach empire launches an invasion with Guymelef Alseides mecha, and Van must retrieve at his mentor Balgus's bidding Escaflowne, the legendary god of protection of Fanelia.