The war of the Sentinels and Demihumans finally ended after a long period of nonstop bloodshed. This war was caused by a single gemstone where the Sentinels called the Divine Treasure of Life. After years of peace, Asahi Gushiken, a boy who was the 74th commander of the Demihumans in his previous life, a hero who saved them from extinction, now lives his life to the fullest. But what will happen if history will repeat itself?