Atelier Escha & Logy: Alchemists of the Dusk Sky is a Japanese role-playing video game developed by Gust Co. Ltd. Given the project code "A15", it is the 15th game in the official Atelier series and the second installment of the Dusk storyline. Hidari remains as the character designer and the game runs on the LTGL engine. It was released in Japan on 27 June 2013.
 An anime adaptation by Studio Gokumi aired from 10 April 2014 to 26 June 2014.
 A version for the PlayStation Vita titled Atelier Escha & Logy Plus: Alchemists of the Dusk Sky was released in January 2015 and featured new playable characters, enemies and story events. A release in other territories came the following year.
 An enhanced port of the game titled Atelier Escha & Logy: Alchemists of the Dusk Sky DX for Nintendo Switch and PlayStation 4 was released on 25 December 2019 in Japan, and on 14 January 2020 in the West along with an additional Microsoft Windows release worldwide.
 Atelier Escha & Logy allows players to choose between two protagonists. The main storyline remains the same regardless of who is chosen, but certain events and endings are only available using a particular protagonist.
 With the new synthesis system, the player can combine different items. The two protagonists Escha and Logy use different kinds of tools to synthesize.
 The game's story takes place about four years after the beginning of Atelier Ayesha: The Alchemist of Dusk in a far away place to the west of the Twilight Land where the local administration hires two new alchemists, Escha and Logy as members of their R&D division. While learning the ropes of their new occupation, Escha and Logy gather friends and companions as they unlock the secrets of the nearby ruins and help the citizens in a world that is still recovering from a catastrophic event known as "The Dusk".
 A 12-episode anime television series adaptation, produced by Studio Gokumi and directed by Yoshiaki Iwasaki, aired from 10 April 2014 to 26 June 2014. The opening is "Asuiro" (アスイロ) by Rie Murakawa, and the ending theme is "Fuyumidori" (ふゆみどり) by Haruka Shimotsuki. The anime has been licensed by Sentai Filmworks for streaming and home video release.
 Escha is tasked by her father Faul to find a new way to improve the harvest on the local orchard. While volunteering at the orchard, Escha, Logy, and Lucille decide to take apples discarded during fruit thinning and use them for a new recipe. While looking for ideas, she and her friends decide to hold a contest to look for recipes at the same time as an eating contest held at the local restaurant. Meanwhile, Logy is selected by the restaurant owner, Duke Beriel, as a contestant in the eating contest, and is assigned to find more participants. He eventually convinces Awin, Linca, and Reyfer to become contestants as well. The next day, the double event begins; after Linca wins the eating contest, she tries the recipes created by Escha and the others, and though she likes all of them, she chooses Wilbell's as her favorite. Linca's ruling inspires Escha to create a new synthetic soil, made with concentrated nutrients taken from different types of soils, for the apple orchard. Clone leads Escha to a section of the orchard that was reserved for alchemists in the Malier family, who have worked hard to maintain it with varying degrees of success, and shows her the tree that Miria worked on. As the latest Malier alchemist in charge of the section, Escha resolved to do her best in maintaining it. Later, Escha, Lucille, and Nio throw a party for Wilbell's victory, and Wilbell reveals that she used magic on her recipe. Escha then reads one of her childhood storybooks to the others.
 As Escha, Logy, Threia, and Reyfer explore another set of ruins, Escha discovers a slab depicting the Unexplored Ruins and a girl levitating above it. The group later discovers a large mural. At the R&D headquarters, Threia explains that the mural was depicting the construction of the ruins they were in. It was an effort carried out by the teamwork between multiple countries who were researching a way to grow plants in a barren land, though they were unsuccessful and their civilizations died out in the end. In need of more information, Threia decides to issue a request for R&D to look for a means to reach the Unexplored Ruins. Escha is initially excited by the news, only for her dreams to be crushed when the members of the R&D division are ordered by the higher-ups to make preparations for another team to do so in their place. Clone later explains to Logy, Nio, and Wilbell that Escha had always aspired to go to the Unexplored Ruins ever since Miria's death, under the belief that someone was living there. Later, the R&D members resolve to explore the Unexplored Ruins first, and Marion drafts a request similar to the higher-ups' instructions, but with a small loophole that would allow them to make the exploration first. Colland realizes their intentions, but decides to submit the request after getting into a fistfight with Duke, a former colleague who is supportive of R&D's cause. After learning of all of this, Escha tearfully thanks everyone.
 The game was adapted into a manga by Chako Abeno. The manga has been running in Dengeki Maoh since the December issue of the magazine, in the year of 2013.
 The game was initially released for the PlayStation 3 in Japan on 27 June 2013, with releases for other territories coming out the following year. In early 2015, a PlayStation Vita version was released, with the western versions coming out in early 2016. This port contained new playable characters, enemies and story events. The physical version for North America was available exclusively through a collector's edition sold on NIS America's webstore and the Canadian retailer videogamesplus.ca.
 Atelier Escha & Logy received a score of 85/80/85/80 in the magazine Dengeki PlayStation, the highest average/aggregate score a game in the series has received from that magazine's ratings so far. Outside Japan, the game has generally positive reviews. The IGN comments: "With tons of things to do, things to make, and areas to explore, Atelier Escha & Logy is a nice fusion of alchemy, adventure, and tactics".
 Most of the critics praise the idea of choosing between two heroes, the battle, and gameplay tactics. Koei Tecmo reported the game to have sold 100,000 units in Japan alone in their presentation material for the period. The game sold 57,550 copies in its first week, making it the second-best-selling PS3 title in Japan for the week of 24–30 June 2013.