is a Japanese manga series written and illustrated by . It was serialized in Shogakukan's Flowers magazine from October 2014 to April 2016, with its chapters collected into a single volume. It tells the story of Princess Saara and Prince Naranbayar, who, in a bid to maintain peace between their rival kingdoms, enter into a pretend marriage and unexpectedly begin to fall in love.
An anime film adaptation produced by Madhouse premiered in Japan in January 2023.
Written and illustrated by , Gold Kingdom and Water Kingdom was serialized in Shogakukan's manga magazine Flowers from October 28, 2014, to April 28, 2016. The series was collected into a single volume, published by Shogakukan on July 8, 2016.
In March 2023, Seven Seas Entertainment announced that it licensed the series for English publication. The volume was released on November 28 of the same year.
An anime film adaptation was announced on June 23, 2022. It is produced by Madhouse and directed by Kotono Watanabe, with writing the scripts and Evan Call composing the music. The film had its world premiere at the Animation Is Film Festival in Los Angeles on October 21, 2022. It was later released in Japanese theaters by Warner Bros. Japan on January 27, 2023. performed the film's theme song "Brand New World".
In 2016, Gold Kingdom and Water Kingdom ranked 33rd in Da Vinci magazine's "Book of the Year" list, and it ranked third in "The Best Manga 2017 Kono Manga o Yome!" list of Freestyle magazine. In 2017, the series topped Takarajimasha's Kono Manga ga Sugoi! list of best manga for female readers. In the same year, the series was nominated for the 10th Manga Taishà Â, and ranked second out of 13 nominees.