Kingdom is an anime adaptation of a manga series of the same title written and illustrated by Yasuhisa Hara.

At the end of the third season's final episode, a fourth season was announced, and aired from April 10 to October 2, 2022.

[1][2][a] The cast returned to reprise their roles.

[3] The opening theme is "Rei -ray-" performed by Suiren while the ending theme is "Genyou (Dazzling)" performed by Haku.

[4] The second opening theme is "geki" performed by zonji, while the second ending theme is "Believe" performed by Misaki.