In the movie, Rantaro and his classmates attend a ninja school where they learn the art of espionage and combat. When the Heaven's Sword is stolen, they are tasked with retrieving it before it falls into the wrong hands. Along the way, they encounter numerous obstacles and challenges, including rival ninja clans and dangerous traps.
As they venture closer to the stolen sword, they realize that the true power of the weapon lies not in its physical strength, but in the unity and determination of those who seek it. With this in mind, Rantaro and his friends work together to overcome their fears and accomplish their mission.
Throughout the movie, audiences are treated to thrilling ninja action and hilarious comedy, as well as poignant moments of camaraderie and friendship. Ninja Kids!!! Summer Mission Impossible is a fun and exciting adventure for all ages, full of heart, humor, and heroism.