Sayonara no Asa ni Yakusoku no Hana wo Kazarou

The story begins with Maquia, who is from a family where all the members stop aging in their mid teens. She has no parents and, although her days are peaceful, she feels lonely. Their peace is shattered when an army invades, seeking the secret to her people's immortality. Leilia, the most beautiful girl in her clan, is taken away, and the boy...