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, marking a significant step in his responsibilities.

Personality assessments reveal Akagi as 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 during Shinkalion operations, and methodical data analysis for performance optimization.

Akagi maintains professional ties with his former Ōmiya colleagues. After Hokuto Hayasugi transfers to Kyoto, Futaba Mihara steps up as Ōmiya's acting director, reflecting ongoing changes within his original team. The surname "Honjō" references a historical station on the Nakasendō highway in present-day Saitama Prefecture.