Nearly 2000 years ago, humankind utilized both magic and science, and built a highly advanced civilization. However, they were attacked by powerful angels, who brought them to the brink of extinction. Humankind revived eventually from this downfall and rebuilt new civilization. However, the battle with the angels was so devastating that many things were lost, such as the technologies of magic and science. In the present time, there is no one who knows the truth of what happened; there are only legends that speak of "magic" and "angels that punished humanity". Even the existence of the angels who destroyed mankind is often dismissed as folklore. On this world there is a continent called Noievarl. There are four countries, each with their own differences, and they begin aggressions to their neighboring nations. In the south is Lamplast Island; the Arten Schwart mercenaries were hired to defend it from invasion from outside continents. However, an angel suddenly appeared and assailed the...