In a world where the elegance of Beverly Hills blends with the art of ninjutsu, an exclusive dojo welcomes an orphaned boy who has been adopted by a group of ninjas. However, the poor kid, known as Haru, lacks the agility and cunning typically expected of a true ninja. Despite his constant failures, he never loses faith in his abilities. When a mystery arises in the martial arts world, Haru sees the perfect opportunity to prove his worth and redeem himself in the eyes of his mentors.
The story complicates when Haru gets entangled in a criminal intrigue related to the theft of a jewel. To make matters worse, his inexperience leads him to cross paths with a beautiful woman in distress, further motivating him to show that he can be the hero everyone doubts he can be. With his natural clumsiness as his greatest obstacle and his heart as his guide, he attempts to become the ninja he has always dreamed of being, but he will learn that sometimes true strength lies not in quick techniques, but in the ability to find the right path even when stumbling repeatedly.
Amid action-packed scenes, endearing comedy, and a hint of romance, Haru's journey will be a rollercoaster, not only to save the girl and solve the mystery but also to discover the true meaning of courage. Will he finally become the ninja the world needs?