"750 Rider" is a manga series that centers on the life of a young man named Kakeru, who becomes entangled in the underground world of illegal motorcycle racing. Set in a gritty urban environment, the story explores themes of ambition, rivalry, and the pursuit of freedom through high-stakes racing. Kakeru, a skilled but aimless rider, is drawn into this dangerous subculture after encountering a mysterious racer known only as "Ghost." Ghost's unparalleled skills and enigmatic presence captivate Kakeru, inspiring him to push his limits and compete in the underground circuit.

The narrative unfolds as Kakeru navigates the treacherous world of illegal racing, where rivalries are fierce, and the stakes are life and death. He forms alliances with other riders, each with their own motivations and backstories, while also facing off against formidable opponents. The races themselves are depicted with intense detail, showcasing the technical aspects of motorcycle riding and the adrenaline-fueled excitement of high-speed competition. As Kakeru rises through the ranks, he begins to uncover the darker truths behind the racing scene, including the involvement of organized crime and the personal sacrifices demanded by the pursuit of victory.

Key characters include Kakeru's mentor, Ghost, whose past is shrouded in mystery and whose influence shapes Kakeru's journey. Other notable figures include rival racers who challenge Kakeru both on and off the track, as well as supporting characters who provide insight into the broader world of underground racing. The story balances action-packed race sequences with moments of introspection, delving into the psychological and emotional toll of living on the edge. Through its exploration of ambition, camaraderie, and the cost of chasing dreams, "750 Rider" offers a compelling portrayal of the underground racing scene and the individuals who inhabit it.