The Demon Lord scouts deceased Japanese salaryman Dennosuke Uchimura, recognizing his overlooked dedication and organizational skills from the human world. He directly appoints Uchimura as one of his Four Heavenly Kings, granting him the title representing Water despite Uchimura's lack of magic. This choice stems from seeing Uchimura's potential to solve the Demon Army's diplomatic and logistical challenges using human corporate expertise.

He leads with a style prioritizing meritocracy and structured management, fostering a work environment akin to a "white company" where workers' rights are respected, overwork is discouraged, and contributions are acknowledged – a stark contrast to Uchimura's past. The Demon Lord entrusts him with critical missions: negotiating alliances like with the Minotaur Army, restructuring military logistics, and investigating corruption within groups such as the Trading Guild.

His long-term ambition is to annihilate the Calamities – natural disasters manifesting as beasts or monsters capable of destroying nations. He seeks to dismantle the world order where rulers hold power solely through the ability to combat these Calamities, regardless of their leadership qualities, aiming to establish a system free from tyrannical rulers. He discloses this deeper purpose only to Uchimura, reflecting profound trust.

He promotes Uchimura to Supreme Tennō of the Demon Army in recognition of his successes in alliance-building and resource management, demonstrating his commitment to rewarding competence. Later, he urges Uchimura to consider becoming the world's next ruler after the Calamities' eradication, revealing his strategic vision for governance beyond conquest.

His relationship with the Four Heavenly Kings, especially Uchimura, is professional yet supportive. He delegates significant authority and resources to his generals, enabling their missions while maintaining supreme command.