Shield of the Moon

Ever since Ouka Kunisaki's younger sister Sayoko was in an accident and passed away on August 15, the cicadas have been unusually loud and irritating, and the evening sunsets have seemed so red that it's scary, almost as if the entire world was burning up. Now, five years have passed, and it's the anniversary of Sayoko's death. As always, the clouds restlessly drift by in the red evening sky. Enveloped in the cries of the cicadas around her, it was as if this is a premonition of something. It then became surprisingly dark, and in the middle of the usual noisy rustling of the trees in the forest, a small, beautiful girl sat beneath the light of the moon that gently poured down upon her. "Who... are you?" The girl's voice sounded so similar to Sayoko's. But to Ouka, who normally was always sleeping by sunset, no one could ever replace Sayoko... Source: ASCII Media Works