"Stratos 4 Advance" is a direct sequel to the original "Stratos 4" series, continuing the story of the Comet Blasters, a team tasked with protecting Earth from meteoroid impacts. The narrative shifts focus to Mikaze Honjo, a former Comet Blaster pilot who now serves as an instructor at the Shishigahara Training Center. Mikaze mentors a new generation of trainees, including Ayamo Nakamura, a determined but inexperienced pilot with a strong sense of duty.

The series explores the challenges faced by the trainees as they prepare for the rigorous demands of Comet Blaster missions. Ayamo, in particular, struggles with self-doubt and the pressure to live up to the legacy of her predecessors. Meanwhile, Mikaze grapples with her own past and the emotional weight of transitioning from an active pilot to a mentor. The dynamic between the two characters forms the emotional core of the story, highlighting themes of growth, mentorship, and resilience.

As the trainees progress, a new threat emerges in the form of a massive meteoroid on a collision course with Earth. The situation forces Mikaze to confront her lingering doubts about her abilities and step back into the cockpit to lead the mission. The series builds tension as the team devises a high-stakes plan to intercept and destroy the meteoroid, combining their training, teamwork, and determination to save the planet.

The narrative balances character development with action, showcasing the technical and strategic aspects of the Comet Blaster missions. The supporting cast, including fellow instructors and trainees, adds depth to the story, providing a broader perspective on the challenges and camaraderie within the Shishigahara Training Center. "Stratos 4 Advance" maintains a steady pace, blending personal struggles with the urgency of the impending disaster, culminating in a climactic mission that tests the limits of the characters' skills and resolve.