Genji Kajarishi is a captain in Unit 2 of the National Security Ninjutsu Case Countermeasures Department, known as Annin. This government agency regulates ninja clans operating secretly in modern Japan. Publicly, he functions as a competent detective within Annin, investigating ninja-related cases. Secretly, however, he maintains an illicit alliance with the Koga ninja clan, making him a corrupt element within the agency. He leverages his official position to advance the Koga clan's goals. His betrayal involves coordinating actions with the Koga, sharing intelligence, and manipulating Annin operations to benefit the clan, particularly in their conflict with the rival Iga ninja. This duality defines his role. His surname, Kajarishi, translates to "Chinese lion," while his given name, Genji, incorporates characters meaning "mysterious" or "occult" and "two."