2142. In a rebuilt world, people live much longer, many economic and environmental crises have been brought under control, and whole underwater megacities have grown in the deep ocean. Forty years have passed since the asteroid Sésso-seki nearly erased the Earth from the face of the universe. Akira Kimura—an ученая who led the project that prevented the catastrophe—has become a world-famous celebrity. But now she is certain: someone is hunting her, and they want her eliminated.
Afraid for her life, Kimura contacts her former head of the security service, who, after they parted ways in the past, became a police officer. However, when he arrives in the underwater city where she has set up her headquarters, he finds only a disfigured body of the former director. And then he decides to go all the way—betting his career, his family, and even his own life—to find out who was behind her murder. To do so, he will have to return to events from long ago, where dark secrets are hidden—secrets that it would be better not to remember.