At Azure Coast Magic Academy, Ivy, a ten-year “waste”—yet a prophecy marks her Celia’s rival, who throws her off a cliff. But her blood awakens Nox, an SSS merman who claims her as master. Four more follow: Vulcan, Leo, Kane, Carter. She is the reincarnated War Goddess who sealed the Demon Lord. Her returning power re-seals him; Celia is cast out.