The hero is a video game designer in modern times. After the marriage broke up, he always kept a distance from the heroine's initiative and enthusiasm, because the heroine was the object of his good friend's desire. After his daughter passed away from a terminal illness, he began to doubt whether the reality he was living in was a game. Setbacks came one after another, including a friend stealing his game copyright and a serious traffic accident. In the end, he chose to commit suicide to end it all, which brought him to the future 700 years later. In the future, the male protagonist is a laboratory supervisor. During an experiment to simulate the Big Bang, he accidentally discovered that his daughter was in ancient times and was in danger. In order to make up for the regret of losing his daughter in modern times, he came to ancient times and met the heroine again here. While saving his daughter, he also won the heroine's favor. When he thought he had a happy ending, he...