"Just nowis thatis it light?" Five heroes take on the mission to lead mankind to break through many difficulties and restart the light. In 2261 A.D., in order to punish human beings for destroying the solar system, the g**-rank civilization blocked the sun with the moon, plunged the earth into endless darkness, and sent "rebels" to manage human beings and block technology. The earth has since entered the Dark Era. But the appearance of a boy is like a golden light slowly tearing through this endless "long night".