Record of Grancrest War - Season 1 Episode 10 Blade of Betrayal
Overview: After subjugating Starck, Waldlind barely pauses before invading Altirk. Villar joins forces with neighboring domains Kilhis, Regalia, and Haman to repulse Waldlind, but then a new enemy arrives from the seas. It's Milza Kuches, price of Dartania, who once looked up to Villar. Milza has forsaken Villar, instead becoming Marrine's sword. And with the Dartanian fleet in tow, he's about to unleash a furious assault on Altirk.