Professor Layton and the Eternal Diva

Professor Layton and the Eternal Diva is a 2009 Japanese animated mystery film directed by Masakazu Hashimoto, written by Aya Matsui from a story by Akihiro Hino and produced by P.A. Works and OLM. The film is based on the Professor Layton video game series by Level-5, taking place between the events of the video games Professor Layton and the Last Specter and Professor Layton and the Miracle Mask. In the story, renowned opera star Janice Quatlane contacts her former teacher, Professor Hershel Layton, after encountering a young girl who claims to be the reincarnation of her dead friend. While Layton and his apprentice, Luke Triton, are attending one of Janice's performances, they get unwillingly pulled into a puzzle-themed battle royal where the winner will apparently receive "the gift of eternal life". According to Level-5, the film stays true to the games, with music, puzzles and characters.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.