A group of intrepid young warriors faces their biggest challenge yet in an exciting theme park. Frustrated by boring vacations, Tum Tum, Colt, and Rocky, three brothers trained in martial arts, decide to spend the day at Mega Mountain, an extravagant amusement park filled with rides and fun. But their day of enjoyment turns into an epic adventure when a group of villains takes over the park.
Led by a ruthless mogul named飯よう, the intruders want to use a secret artifact to carry out their dark plans. The situation becomes critical when the brothers realize that the park and everyone inside are in grave danger. With their cunning and combat skills, the three ninjas become the last hope to rescue the park visitors and thwart the villain's plans.
As the action unfolds, the brothers must not only use their martial arts skills but also rely on their wit and teamwork. With an ending full of unexpected twists and moments of humor, this film tests the protagonists' bravery and family bond as they fight to protect the innocent and, above all, save the day. In this rollercoaster of emotions, the ninjas will demonstrate that true strength lies in passion, courage, and family.