* Based on the light novel series written by Kareno Akira and illustrated by Ue. 500 years have passed since the human race went extinct at the hands of invading beasts. The surviving races escaped into the floating islands in the sky, out of reach of the vicious monsters. Warrior Willem Kmetsch wakes up from a long, cursed slumber and finds himself to be the only human alive. He adapts to his new life and settles into a routine of odd jobs. One day, he accepts a job offer to become an Enchanted Weapons Technician, but little does he know, these 'weapons' are actually a young group of girls from the Leprechaun race. As the only race compatible with the ancient weapons of the human race, the Leprechauns are utilized to secretly fight against the beasts who have made it into the sky. Willem becomes the caretaker of these girls and foster a familial connection. Now, Willem suddenly finds himself in a position which he was never in before as a warrior. He struggles with himself as he painfully and helplessly waits for his loved ones to come home from battle.