Sora was lying in front of a hospital. He was seriously injured, and as he was about to die, a nurse named Yamami Yu helped him. He was taken to an emergency ward, where he met a beautiful woman, Mikage Reika. She was the hospital director and asked him to become a test subject. Since he had no relatives, he accepted. Then, Yagami Yu was assigned to take care of him. From that day on, his fate changed significantly.