When mysterious black monsters known as the Kitoralsus begin threatening Japan, a special defense force is assembled to combat the threat using a remarkable technology: the Shinkalion, advanced mecha that transform from actual bullet trains. At the center of this high-stakes battle is Hayato Hayasugi, a spirited young boy who discovers he possesses the unique ability to pilot the E5 Hayabusa Shinkalion, the most powerful of these transforming machines. Alongside a diverse team of young pilots, each commanding their own distinct bullet train robot, Hayato must master his newfound responsibilities and work with the secretive Shinkansen Ultra Evolution Institute to protect the nation. The series blends the adrenaline of giant robot battles with the everyday challenges of youth, exploring themes of teamwork, courage, and self-discovery. As the young pilots face increasingly formidable enemies, they learn that true strength comes not just from their machines, but from the bonds they forge with one another, making this an exhilarating ride for fans of action-packed mecha adventures.