Kai, a young Dark Knight who comes from a household of elite Dark-job holders, decided to pursue even greater strength. One day, he saved the Princess who was being attacked by a monster, which ended up being the trigger for him to join an academy specialized in teaching Holy jobs. Together with Millia, his childhood friend as well as a Paladin, his little sister Chloe the Necromancer, and Princess Shel, who later becomes his tutor, their thrilling academy life begins. Despite having a body so incompatible with Holy magic that he almost passes out whenever he uses it, he is resolved to endure all hardships, for he aspires to become the polar opposite of the strongest Dark Knight: the kingdom's strongest Royal Paladin! (Source: Manga UP! Global)

Kai, who comes from a family that specialized in dark-style occupations, sought even greater strength. One day, he saved the fourth royal princess who was under attack by monsters. This was the the trigger for him managing to join an academy that specializes in training people for holy occupations. He endures training so incompatible with his physical constitution that it could make him faint, all to become the polar opposite of the strongest dark knight—the Kingdom's strongest holy royal knight, The Royal Paladin. An occupation-change drama of a genuine dark knight begins!! "Now let us enjoy our deathmatch—to our hearts' content"

Rion, a boy who has survived for ten years in the "Demon Realm," a land overrun with monsters, is secretly a former prince, banished for being a cursed child without a crest. Though he had vowed never to involve himself with the royal family again, Rion learns of an assassination attempt on his younger sister, Princess Celestia, and finally decides to return to the capital. Concealing his true identity, Rion reunites with his sister, acting as her bodyguard at times, and a mysterious swordsman at others, eliminating the threats against her one after another. When an unprecedented crisis, one that threatens the entire kingdom, befalls the princess, Rion unleashes the true power he has kept hidden—the power of the Heroic King that dwells within him! A clandestine, unrivaled fantasy of the strongest prince, inheriting the power of legendary kings!