THE MAGICAL GIRL AND THE EVIL LIEUTENANT USED TO BE ARCHENEMIES

An evil organization invades and destroys everything in its path. The brains of the brutal operation is the king’s right-hand man, an evil lieutenant named Mira. Everything changes when a magical girl named Byakuya Mimori tries to stop the evil group in their tracks. When Mira confronts her, he knows it’s love at first sight. What will become of Mira and Byakuya, stuck between orders and love? (Source: Crunchyroll) — Description from AniList community (anilist.co).