Case Closed: The Darkest Nightmare, known as in Japan, is a 2016 Japanese animated action crime thriller film. It is the twentieth installment of the Case Closed film series based on the manga series of the same name, following the 2015 film Case Closed: Sunflowers of Inferno. The film was released on April 16, 2016. The theme song for the main film was by B'z. imdb.com