In a village in the Comoros, the young Gaia and her grandfather make a living from fishing for coelacanths, large fish classified as a rare and protected species. But one day, a sea monster attacks them and devours the old man.
 
After being rescued by a police ship, Gaia agrees to take the captain to a submarine inside the Blue Hole, where the coelacanths come from. They then discover that huge sea creatures make their way through our Ocean: the Blue Hole is actually a temporal rift leading to the Mesozoic. An expedition, under the orders of Doctor Hawk, is led aboard the Chronos to study this extraordinary discovery. But the ship is swept away in the Blue Hole and the survivors are found 65 million years in the past. They then discover Hawk's plan: to eliminate the problem of pollution by installing a huge cylinder between the two worlds, to dump our waste in Prehistory. No matter the consequences...
 
A second blue hole is discovered in prehistoric times, leading even further into the past. In the meantime, a gigantic asteroid is heading towards Earth...

The "Blue Hole" is a portal that leads back to the prehistoric age. In light of this astonishing discovery, the United Kingdom and the United States dispatched a joint team to the Jurassic world 145 million years ago for a full-scale investigation. But a sudden disturbance cut off their communication with the modern world. Only a few people and their equipment are left. A survival adventure in a terrifying world where everything is unknown and dinosaurs roam free has begun!
 
(Source: Kodansha, translated)

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