Jamie Hoshino fought for Blue Fixer, a military organization defending Earth against the S-1 invasion force commanded by Zeo Gattler. Born in Europe to a Japanese mother, she possessed a mixed cultural heritage. Within Blue Fixer, Jamie mediated, facilitating protagonist Marin Reigan's integration into the team and smoothing tensions between him and combat pilots Jack Oliver and Raita Hokuto. Her diplomatic efforts fostered team cohesion during conflicts against the S-1 forces.

She participated in critical missions, including the defense against Gattler's forces during the "False Peace Conference," where S-1 staged a deceptive negotiation followed by an immediate attack on Earth dignitaries. Jamie's combat-ready role involved direct engagement in strategic and combat activities alongside the team.