In the secluded island of Iwado, a movement for independence gains traction. Ao Fukai, a 12-year-old boy with an absent father, resides with the elderly Dr. Toshio as he prepares to start middle school. His mother vanished ten years back under mysterious circumstances. Meanwhile, Naru Arata, Ao's childhood friend and the story's central figure, possesses a latent power named 'Yuta' stemming from a childhood incident. A strange entity named 'Secret' emerges abruptly, launching an assault on the island's Scub Coral lifeform. Fueled by his determination to safeguard the island, Ao pilots the military FP 'Nirvash' from a Japanese military vessel in response to this threat.