"Immortal Grand Prix" (IGPX) is set in the year 2048, where high-speed mech racing has become the world's most popular sport. The series centers on Team Satomi, a rookie squad competing in the Immortal Grand Prix, a prestigious racing league where pilots control advanced mechs called IG machines. The races are intense, combining high-speed action with strategic combat, as teams aim to outmaneuver and outlast their opponents on a challenging track.

The story begins with Team Satomi, a group of young racers, being unexpectedly promoted to the top-tier IGPX league after a surprising victory. The team consists of Takeshi Jin, a skilled but inexperienced pilot with a strong sense of determination; Liz Ricarro, a confident and competitive racer; Amy Stapleton, the team's cheerful and resourceful mechanic; and River Lim, the team's composed and strategic leader. Together, they face the daunting task of competing against elite teams with far more experience and resources.

As the season progresses, Team Satomi struggles to find its footing in the highly competitive league. Takeshi, in particular, faces personal challenges as he grapples with self-doubt and the pressure to prove himself. The team's dynamics are tested as they encounter rival teams, each with their own motivations and strategies. Notable rivals include Team Sledge Mamma, a dominant force in the league, and Team White Snow, known for their precision and teamwork.

The narrative explores themes of perseverance, teamwork, and growth as Team Satomi learns to overcome their limitations and work together. The races themselves are a blend of high-octane action and tactical decision-making, with pilots relying on both their individual skills and their ability to coordinate with teammates. The series also delves into the personal lives of the characters, providing insight into their backgrounds and motivations.

Throughout the season, Team Satomi faces numerous setbacks and challenges, but their determination and camaraderie drive them to improve and compete at the highest level. The series builds toward a climactic finale, where the team's hard work and growth are put to the ultimate test in a high-stakes race that could define their future in the IGPX league. The story concludes with a focus on the characters' development and the bonds they have formed, leaving room for reflection on their journey and the lessons they have learned.