The battle between the secret organization Delstar, plotting to conquer Earth, and the Wild Rangers has evolved into a prolonged war of attrition. Amid the conflict, the female warrior Wild Yellow is killed in action. To fill the void, a young warrior named Izumi Reiko is hastily selected as the new candidate for Wild Yellow. Possessing exceptional physical abilities and a strong, disciplined mind, she is expected to strengthen the Wild Rangers even further. However, Delstar's conspiracy continues to deepen without pause. Infiltrating even the core of the operation command center, they turn a training instructor into a mole. This instructor detects the faintest flicker of doubt hidden within Reiko's otherwise resolute heart and gradually manipulates her, bringing her under Delstar's control.