Based on the wildly popular game series, the Ni no Kuni movie has been reportedly been in development for ten years. This lines up, the first game released in 2010. 

Warner Bros. Japan have announced at a recent press conference that they are collaborating with video game developer Level-5 to make this movie. A summer release is planned, but they didn't specify the year, just the season.

The movie is set to star Kento Yamazaki as the voice of its male lead Yu and famed Studio Ghibli composer Joe Hisaishi, who created the music for the games, will return to work on the film’s soundtrack. The only plot details that have been revealed is that the character of Yu will be a schoolboy who travels back and forth from the real world and that of Ni no Kuni with his friends.