Sadako vs. Kayako (貞子 vs 伽椰子, Sadako bāsasu Kayako) is a 2016 Japanese supernatural horror film directed by Kōji Shiraishi. It is a crossover of the Ju-on and the Ring series. The film was first teased as an April Fools' joke on April 1, 2015, but was later confirmed on December 10, 2015, to be a real production. It was released in Japan on June 18, 2016, Indonesia in August 10, 2016 (followed by 4DX in February 15, 2017), and in North American on the streaming site Shudder on January 26, 2017.