Five young men and women at Liuguang Starcrest Academy secretly carry the bloodlines of royal families from another world. Hiding their true identities, they live as ordinary students, but in reality they are a legendary team of guardians bound together by fate. Team captain Amano Rinsei, whose real name is Chi, comes from a family of guardians and wields ice and holy light, coordinating the team's battles. Princess Fujisaki Ruozhi of the Red Lotus royal family commands the powers of grass and fire, providing long-range support and healing her companions. The twin princesses of the Canglan Divine Realm, Haizuki Lianyin and Liuli Jinduo, command water and wind, and earth and metal, respectively, protecting the team and bolstering its abilities. The orphaned heir of the Glacier Divine Realm, Mishen Cangshun, controls the thunder of spacetime and directs the battlefield with tactical formations. Isera, also known as Yejian Youmi, who turned dark after suffering heartbreak, excels at illusions and shadows, striking enemies at close range.
Each of them bears regrets tied to their past: some have been displaced, while others struggle with inner demons. As shadowy forces threaten the mortal world, Rinsei's steadfast bonds bring them together. From warily sizing one another up and fighting alone to standing side by side, the five guardians awaken their innate powers one after another, leaving the gloom of the past behind. Clad in the holy garments of the Apocalypse in the name of protection, they unravel the mysteries of their origins and settle old grudges, while joining forces to repel the darkness and shoulder the duty of protecting the world as young people.