20 Seiki Denki Mokuroku

In Meiji era Japan, civilization is highly dependent on advanced steam power. Two individuals meet in Kyoto and uncover the secret of the "20th Century Electrical Catalog", allowing them the potential to realize the dreams they once had. ==Characters==

; : :A timid boy who has a knack of inventing machines. He originally dreamed of ushering in an age of electricity with his older brother using the 20th Century Electrical Catalog, but was forced to repress it following the disappearance of his brother and the catalog. ; : :A trustworthy yet unassertive girl who is part of a family of sake brewers. She dreams of following her deceased mother's footsteps of becoming a sake brewer. She also keeps a pet ermine named . ; : :A talented engineer and heir of a store specializing in steam engines who aims to obtain the 20th Century Electrical Catalog by any means necessary, including an engagement to Inako. ; : :Kihachi's older brother, who has a passion for electricity and aims to help usher a new age with Kihachi before mysteriously disappearing with the 20th Century Electrical Catalog. ; : :A former soldier and schoolmate of Seiroku who has imposing physical strength and is familiar with the 20th Century Electrical Catalog carried by Seiroku. He is also Noriko's fiancé. ; : :Inako's older sister and Kengo's fiancé, who is skilled in martial arts and watches over Inako’s growth, while also secretly possessing the 20th Century Electrical Catalog. ; : :Inako and Kate's witty and cunning classmate who keeps a variety of tools. ; : :Inako and Suzu's British-Japanese classmate who is full of energy. ; : :Kihachi’s shy cousin who is talented at drawing and is the heir to a boarding house. ; : :Yosuke's secretary and bodyguard who mainly serves as his guardian. ==Media==

Light novel 20 Seiki Denki Mokuroku is a Japanese light novel written by Hiro Yūki and illustrated by , with art and backgrounds by Momoka Nagatani. Kyoto Animation published the novel under their KA Esuma Bunko imprint on August 10, 2018 (). On October 25, 2025, Kyoto Animation announced during its "KyoAni no Sekai-ten" ("Meet the Worlds of KyoAni") event that the anime adaptation would be a television series, titled and known in English as Sparks of Tomorrow. It will be directed by Minoru Ōta, with series composition handled by , characters designed by Kohei Okamura, who will also serve as chief animation director, worldview setting handled by , and music composed by Hitomi Koto. The series is set to premiere on July 5, 2026, on Tokyo MX and other networks. An advance screening for the first episode will be held at the 2026 Annecy International Animation Film Festival. The opening theme song is "Eureka Evrika", performed by Luna Goami, while the ending theme song is performed by Ginger Root. Netflix will stream the series globally. ==Reception==

20 Seiki Denki Mokuroku won an honorable mention in the full-length novel category at the 8th Kyoto Animation Awards in 2017. The entry was the only one to win any of the awards available that year. ==References==