Asta

Asta is a top-tier spy operating within the Demon Empire, placed directly under the command of Four Heavenly Kings member Bamilio. Known for her vibrant and fearless nature, she possesses a unique ability to establish telepathic communication with her sister Isuta after drinking coffee. While embedded in the human kingdom on an investigative mission, she continues to relay critical intelligence even in the face of grave danger, making her an indispensable figure for both plot progression and behind-the-scenes support.