Ginji Iwagami operates as a covert protector for Koichiro Kamishiro and his allies during their quest to secure the Crystal Triangle and decipher its divine message. A strategic asset of the Japanese Ministry of Intelligence, he answers exclusively to its enigmatic director, known only as "the Old Man in Hakone." His assignments pit him against rival factions such as the Hih Tribe, CIA, KGB, and additional hostile groups seeking to derail the protagonists’ efforts.

During a critical mission at Mount Aso, he intervenes decisively to neutralize Genho, a Hih priest endangering the team, then orchestrates their retreat from a collapsing ancient shrine. At Mitsurin Temple, he uncovers and confronts a Hih infiltrator disguised as a monk, exposing both their inhuman essence and ties to the celestial threat of Nemesis. Though skilled in tactical combat and weaponry, he recognizes the constraints of human tools when facing otherworldly enemies.

Ginji embodies pragmatic efficiency, maintaining a relentless focus on mission success while coordinating with Koichiro’s team. His history and personal motives remain undisclosed, with no elaboration on his role beyond these documented operations.