Natsume is a Japanese woman who serves as a representative and informant for the non-governmental organization OWL, acting as a liaison between the organization and the mercenary Canaan. She is characterized by a calm and punctual demeanor, but she also displays a manipulative side and shows little concern for the well-being of the people she employs. Initially, she finds Canaan's obsessive drive to avenge the death of her mentor Siam to be irritating, though she continues to work with her out of professional necessity. Natsume is acquainted with Santana, whom she dislikes, and she occasionally gives him advice on how to treat his partner Hakko. Her role in the story is primarily that of a handler and information broker, pushing events forward through her behind-the-scenes influence rather than direct action. She possesses no notable combat abilities but relies on her shrewdness and organizational connections to achieve her objectives. Over the course of the narrative, Natsume remains a pragmatic and detached figure, focused on the interests of her NGO above personal loyalties.