After the meteorite "Artemis" crashed into the moon, an unidentified phenomenon began to affect humans: the "Reproductive System Disease". 12 years have passed, and in a world with a birth rate of 0, humanity has focused its collective efforts on researching cloning and immortality. Amidst this, Ashiro Koshiro continues to search for the cause of the disease. Suddenly, a woman appears, handing him a mysterious suitcase...