The Prince's New Clothes
Bojji, a prince in a world where kings are ranked by their deeds and skills, is considered unfit to be the next king due to his disabilities. He runs into Kage, a shadow being with whom he can converse, but who also takes advantage of Bojji's kindness.
Aired 15/10/2021EP 1 - The Prince's New Clothes

2021
Ranking of Kings
Unable to hear, speak, or wield a sword, Prince Bojji doesn’t seem like a typical heir to the throne—and his kingdom agrees. But his fateful encounter with Kage, a shadow on the ground, gives him his first true friend. The two set off on a grand adventure and, together, form a bond that can overcome any obstacle...even being king.
(Source: Funimation)