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Tên khác: 20 Seiki Denki Mokuroku -Eureka Evrika-, Nijūseiki Denki Mokuroku -Eureka Evrika-, Nijuuseiki Denki Mokuroku -Eureka Evrika-, 20th Century Electricity Catalog, A Luz do Futuro, 二十世紀電氣目録-ユーレカ・エヴリカ-, Centelhas do Futuro

In an alternate 20th century Kyoto, two brothers dream of bringing about the Age of Electricity with their 20th Century Electrical Catalog. However, when Seiroku Sakamoto brings the catalog with him to war and never returns, his younger brother Kihachi Sakamoto is left by himself. One day, a chance meeting with Inako Momokawa, the daughter of a sake brewer, reunites Kihachi with the lost catalog and kickstarts this dream once more. However, he isn't the only one who wants the catalog...