Three months after the Trinity Incident, Beck is now seen as a beloved hero in the eyes of the citizens, and a fan favorite in the Battle Colosseum. Now with Call as a full time partner, Beck wishes to focus on finding is older sister Ray, who he failed to save before. But that search gets put on hold when a mysterious robot team begins to dominate the Battle Coloseum, their creator having history with Call's developer, Dr. Soichiro Sanda. These robots have the ability to utilize the intensity of their emotions to increase their power, something that Dr. Sanda believes is too dangerous for robots to use. Meanwhile, Call has begun experiencing strange sensations that contradict with her programming. Sensations that are synonymous with emotions she shouldn't possess. This leads her on a journey of discovery that puts into question who she is and why she was even made. In the end, Beck may be the only one she can trust. When Team Blitz show signs of dangerous activity, and Call's life is put in danger, the world once again cries out for a mighty hero. One with the purest of hearts and the ability to heal the wounds of the past. Once again, the world needs Mighty no. 9.