Windaria
童話めいた戦史ウインダリア (original)
In a land filled with magic and mystery, two rival kingdoms are readying for war: Isa, the beautiful water-laden city, and Paro, the industrialized wasteland. Windaria follows the tale of two sets of lovers: Marin and Izu, a young pair of farmers who are devoted to one another, and Ahanas and Jill, princess and prince of the rival kingdoms. With war approaching, these star-crossed lovers will experience the true depth of tragedy as they struggle to survive.
Starring Toru Furuya, Naoko Matsui, Kazuhiko Inoue, Waka Kanda, Gara Takashima, Sho Saito, Kan Tokumaru, Rihoko Yoshida, Norio Wakamoto, Hidekatsu Shibata
It's a animation and family movie, and has a rating of 7.1 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from United States.