Nagumo Akira is a highly skilled assassin and one of the most prominent members of the Order in the manga and anime series 'Sakamoto Days.' Charismatic and unpredictable, Nagumo presents a carefree, playful demeanor but is extremely dangerous and capable in battle. He is known for his exceptional combat skills, intelligence, and versatility, making him a formidable opponent. Nagumo serves as both a rival and ally to the protagonist, Sakamoto, often adding complexity and intrigue to the story’s dynamics.