Zitat
13-year-old protagonist Ao Fukai lives together with an elderly doctor, Toshio, on Iwado Island in Okinawa. His father's whereabouts are unknown and his mom was "taken away" 10 years ago. His childhood friend, Naru Arata is somewhat frail, physically, and requires an inhaler; however, she seems to have "yuta" power due to an accident that happened when she was very young.
A mysterious entity called "Secret" suddenly appears and launches an attack on the Scub Coral lifeform on the island. In his fervent desire to protect the island, Ao launches a certain military robot called "Nirvash" aboard a Japanese military transport.
...