Question: what does Professor Layton and the Eternal Diva and Eleanor's Secret have in common?

Context articles: Professor Hershel Layton
Eleanor's Secret
List of Professor Layton media
Tsuneyoshi Saito
Professor Layton and the Eternal Diva
Professor Layton and the Miracle Mask
Professor Layton and the Last Specter
Professor Layton and the Unwound Future
Professor Layton and the Diabolical Box
Professor Layton vs. Phoenix Wright: Ace Attorney

Professor Hershel Layton (エルシャール・レイトン教授 , Erushāru Reiton-kyōju ) is a fictional character and protagonist of the "Professor Layton" fictional universe, created by Level-5.
 Professor Layton is a player character in a series of puzzle adventure video games starting with "Professor Layton and the Curious Village" and most recently "Professor Layton and the Azran Legacy", in which he and his apprentice Luke Triton (with his assistant, Emmy Altava, travelling with the two in "The Last Specter", "Miracle Mask" and "Azran Legacy") investigate mysteries while solving various brain teasers.
 He also appears in an animated movie, "Professor Layton and the Eternal Diva", and has featured in manga and novels that have not been released in English.
 Born under the birth name "Theodore Bronev" in "Azran Legacy"
Eleanor's Secret (original French title Kérity, la maison des contes) is a 2009 Franco-Italian animated feature film directed by Dominique Monféry.
 It won the special distinction prize at the 2010 Annecy International Animated Film Festival.
 The film was produced in separate versions with French and English soundtracks.
The "Professor Layton" video game series is a franchise of puzzle games produced and developed by Level-5, with some games being published by Nintendo outside Japan.
 The series is primarily based on games for the Nintendo DS and Nintendo 3DS systems.
 It debuted on February 15, 2007 with "Reiton-kyōju to Fushigi na Machi" (レイトン教授と不思議な町 , "Professor Layton and the Mysterious Village") , eventually localized as "Professor Layton and the Curious Village" in the North American and PAL regions.
Tsuneyoshi Saito (斎藤 恒芳 ) (born April 28, 1965) is a Japanese composer and arranger for anime shows and video games.
 He composed the original music for the third Tenchi Muyo film "Tenchi Forever!
 The Movie", the feature anime film "", the "Fafner" anime series including the original anime series, its feature film "Fafner: Heaven and Earth", and its 2014 sequel "Fafner: Exodus" He composed and arranged the soundtrack for the anime series "Dennou Coil" "Kamen Rider Kiva", and "".
 In video games, he co-composed music for "Professor Layton and the Eternal Diva", and co-arranged the music for "Final Fantasy VI" that appears on the album "Final Fantasy VI Grand Finale".
Professor Layton and the Eternal Diva (レイトン教授と永遠の歌姫 , Reiton-kyōju to Eien no Utahime ) , also known as Professor Layton: The First Movie (レイトン教授 ザ・ファースト・ムービー , Reiton-kyōju Za Fāsuto Mūbī ) , is a 2009 anime mystery comedy-drama film directed by Masakazu Hashimoto 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".
Professor Layton and the Miracle Mask is a puzzle adventure video game developed by Level-5.
 It is the fifth game in the "Professor Layton" series, the second in the prequel trilogy of games, and the first in the series to be developed for the Nintendo 3DS.
 "Miracle Mask" was released as a launch title for the Nintendo 3DS in Japan in February 2011, becoming the best-selling game on the day of the system's launch.
 The game was later released worldwide in October 2012.
 "Professor Layton and the Miracle Mask Plus", an enhanced edition featuring new puzzles and added cutscenes, was released on the Nintendo eShop in Japan in February 2013.
Professor Layton and the Last Specter, known in Europe as Professor Layton and the Spectre's Call, is a puzzle adventure video game produced by Level-5 for the Nintendo DS handheld game console.
 "Last Specter" is the fourth game in the "Professor Layton" series, and is a prequel that takes place three years before the first trilogy, detailing how Professor Layton met his apprentice, Luke Triton and introducing Layton's assistant Emmy Altava.
Professor Layton and the Unwound Future, known in Europe as Professor Layton and the Lost Future, is the third game in the first trilogy of the "Professor Layton" puzzle game series by Level-5.
 It was first released in Japan in November 2008 and was later released in North America in September 2010 and in Europe and Australia in October 2010.
Professor Layton and the Diabolical Box, known in Australia and Europe as Professor Layton and Pandora's Box, is the second game in the "Professor Layton" series by Level-5.
 It was followed by a third game, "Professor Layton and the Unwound Future".
 The game follows Professor Layton and his self-proclaimed apprentice Luke as they travel cross-country by train to solve the mystery behind a mysterious box that is said to kill anyone who opens it.
Professor Layton vs. Phoenix Wright: Ace Attorney is a visual novel adventure puzzle video game for the Nintendo 3DS, and was developed by both Level-5 and Capcom, the former publishing it in Japan while Nintendo published it worldwide.
 The game is a crossover between two games series from both developers, combining the puzzle and exploration elements of Level-5's "Professor Layton" series, and the general trial mechanics of Capcom's "Ace Attorney" adventure series, the latter enhanced by the addition of a few new elements.
 Shu Takumi, the series director for the "Ace Attorney" series, assisted with the scenario designs for the game.
 The plot focuses on Professor Layton and Phoenix Wright, along with their associated assistants, working together to solve the mystery behind a young girl that both encounter separately, and a strange world they are brought to through her, with Layton focused on finding clues to solve the mystery, while Wright focuses on protecting people who are put on trial for being "witches".