Destination of transfer: 200,000 years ago. Destination of return: Revenge.

The war between humanity and the demon race had lasted for decades. Humanity, lacking magic, was on the verge of being destroyed by the demon race, against whom modern weapons were ineffective. At one point, a young boy soldier who time-slipped two hundred thousand years into the past is granted "eternal life" by God. He resolves to alter the course of human history as he travels through time, ensuring that magic technology develops, and to achieve his revenge against the demon race. ※This story is entirely fictional and makes no claims regarding any actual universe, Earth, scientific laws, historical events, people, organizations, or anything else.