During the Japanese Warring States Period, ninja groups belonging to different daimyo were also wrestling in the dark. On a moonlit night with few stars, Iga ninjas Yamata (played by Sanyuan Mayun), Jinnai (played by Kashiwara Shuji), and Lao Shu accidentally collided with their opponents while performing a spy mission. During the period, a huge fireball suddenly floated across the sky, which surprised everyone. After Yamata and others returned to the village, they went to the forest to explore the truth of the fireball under the instructions of the leader. On the way, they met Rinlin (played by Yui Mika) and her companions from the same faction, and they all went together. As a result, in the dense forest, the Iga ninjas were attacked by unknown creatures. The opponent was agile and swift, with great lethality, and the ninjas were killed one after another. Although Yamata, Jinnai, Rinlin and others escaped by chance, they did not know that alien aliens from outer space were multiplying. For a time, the Iga village was poisoned, and Yamata and others also faced unprecedented challenges...