He and Ayari had never seen their father since birth, and their relationship with their mother was not harmonious, but now he had to travel back nineteen years to find someone who could be his father and match his parents, even if it seemed to him that it was a wrong relationship. Of course, he has no interest in the grudges of the previous generation, all just to prevent a suspicious humanoid alien creature named R5 from going back in time to change history. The reason is very simple, if Ayarei's mother chose to leave Earth with R5 nineteen years ago, Ayari would disappear after nineteen years because of "contradictions". However, when she and Ayari traveled through time and space with M6, who had the same purpose and claimed to be R5's sister, they were attacked by an unknown attack, and when the spaceship landed, what they saw was the earth that had ushered in the end of the world and humanity was collectively "cocooned......