In this story, Ella encounters two mysterious beings named Kaguya and Joshua in a dream-like vision, who reveal they are from thousands of years in the future and were responsible for ensuring her best friend Helana would be present to help her with an important task ahead. The next morning, Ella discovers that Helana has long believed in Kaguya as a legendary figure, and Helana explains that both Ella and Kaguya are destined to be post-apocalyptic heroes who will guide humanity through extinction-level events.