In the universe of Sailor Moon, a new cosmic threat emerges: the Solar Shadows, a dark force born from the heart of the Sun, aim to consume the light of every planet. To counter them, an ancient forgotten guardian awakens — Sailor Sun, protector of the primordial solar flame.

Behind this radiant warrior is Hikari Amaterasu, a bright and passionate high school girl who discovers a mysterious medallion tied to her true identity. Guided by a solar spirit named Solis, she joins the Sailor Guardians to fight back the darkness and restore balance to the cosmos.

But Sailor Sun carries a heavy secret: she was once connected to the very birth of the solar system… and her powers may hold the key to the universe’s salvation — or its end.