Love between angel and devil

During a war in ancient Japan, between two kingdoms, the demon kingdom, Emberfall and the angel kingdom, Mythoria, love between an angel prince, Aiko, and a demon princess, Miku, grows up. Even though they know that their love is dangerously forbidden, they keep it a secret, trying not to let anyone find out about their relationship. But the hardest part is their parents. Those kingdoms are enemies for thousands of years. What if their relationship is revealed? Will Aiko and Miku try to bring the kingdoms close or will they run away to save their love?