Ousama is based on a tale about a young prince named Bojji.
Because of his disability, he has to deal with ableism from his constituents, many of whom are unaware that he is deaf and mute. They call him the "useless prince," and they think he's a complete moron. Nonetheless, Bojji is not a weakling, despite his physical limitations.
As soon as Bojji made friends with a shadow creature, though, things began to improve. The shadow, Kage, comes around to the naive Bojji and shows him how to conquer his worries.
In this anime, Bojji's major motivation is to become the best possible king, both for his own satisfaction and to show his subjects that they were mistaken about him.
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