Tsuihou Ouji no Anyaku Musou: Makyou ni Suterareta Ouji wa Eiyuuou-tachi no Chikara wo Uketsugi Saikyou to Naru

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!