Watanabe functions as Mitsuki Hattori's section chief in their office environment. Mitsuki deeply admires him and pushes herself through excessive work, striving to become his indispensable right-hand person. His scheduled transfer to another section directly motivates Mitsuki's resolve to enhance her appearance, hoping he will notice her before his departure. No details are provided regarding his personality traits, physical characteristics, or specific actions within the story. The character does not feature or evolve in any other seasons, films, OVAs, or spin-off materials. Information about his background, relationships outside his professional dynamic with Mitsuki, or narrative impact beyond being the focus of her unrequited admiration and the impetus for her actions remains unavailable.