World of Delight (レインツリーの国, Reintsurī no Kuni, Raintree Country) is a 2015 Japanese youth romance film directed by Yoshishige Miyake. It is based on the novel Raintree no Kuni by Hiro Arikawa. It was released on November 21, 2015.

This work is a love story between the main charactor, who is a normal hearing person, and the heroine who is the late-deafened.Hiro Arikawa, the author of this work, had experience of having her husband suffer sudden hearing loss twice, and fortunately, because he was treated quickly, he did not lose his hearing and was able to return to hearing, but this experience of hers would have gone into the image of a heroine who suffers from hearing loss. There is an expression in the work where she is distressed because she cannot hear Nobuyuki's voice.