Raion Ōno is a 13-14-year-old male born on August 1, making him a Leo. He stands 151 cm tall, weighs 40.1 kg, and has blood type O. He exhibits exceptional quick thinking and proficiency in spontaneous deception, though he is physically inept. Raion operates by a personal framework of truth and justice, but this can lead to errors through overanalysis. His emotions sometimes intensify, impacting his decisions.

He possesses two distinct abilities: "Perjury Authority," allowing him to fabricate highly persuasive falsehoods, and "Sharing Rights," which permits him to extend his capabilities to others. These skills primarily serve his survival and strategic objectives.

Raion becomes caught in political upheaval after detecting a shift in leadership—the new Emperor differs significantly from the predecessor. When the Queen declares her intent to overthrow the Emperor, Raion allies with an individual named Goboura to resist her forces. He infiltrates the Queen's military as a double agent, outwardly posing as a loyalist to the Emperor while covertly sabotaging her operations.

Initially harboring intense animosity toward the Emperor, Raion's perspective shifts through interactions with Haruto Yanagi, one of the Emperor's allies. Despite Raion's hostility, Yanagi extends authentic friendship. This relationship challenges Raion's convictions about justice, fostering internal conflict and fueling his emotional turmoil, central to his development.

The narrative follows his navigation of loyalty, deception, and evolving beliefs as he confronts the consequences of his choices. His actions directly influence the political struggle between the Emperor and the Queen, particularly in the story's second phase. A distinct personal quirk is his lack of skill in drawing.