Akagi Honjō serves as an operator at the Shinkansen Ultra Evolution Institute's Ōmiya Branch, supporting Shinkalion operations and coordinating branch activities. He works closely with colleagues Futaba Mihara, Daiya Oyama, and Minori Sanjo, reporting to superiors Shinpei Izumi and Hokuto Hayasugi. He later advances to become acting director of the Institute's Kyoto Branch, taking on greater leadership responsibilities. Akagi is determined and passionate, confronting challenges directly and demonstrating bravery to protect others. He shows strong loyalty to his team and mission, a deep sense of responsibility, and caution regarding potential security threats. His operational style emphasizes strict adherence to rules and procedures, meticulous attention to detail, and methodical data analysis. In one personal interaction, he meets Futaba Mihara at Ueno's science museum, a casually framed pre-date encounter that unfolds amidst discussions on human evolution.