Sparks of Tomorrow

"We'll make the 20th century the age of electricity!"
The protagonist, Kihachi Sakamoto, writes down his envisioned electrical inventions in the "20th Century Electrical Catalog," vowing to realize his dream with his admired older brother, Seiroku. However, Seiroku, who went off to war with the catalog, is killed in action, and the catalog goes missing.
Time passes, and a shocking encounter with Inako Momokawa, the daughter of a sake brewer, sets Kihachi's stagnant life in motion again. Meanwhile, Yosuke Mitsuzoe, the heir to a steam-powered conglomerate who is also searching for the catalog, pressures Inako into a political marriage in exchange for a loan to the Momokawa family. Inako escapes Yosuke and reunites with Kihachi, and in her hands is the "20th Century Electrical Catalog," which was supposed to be lost

The missing "20th Century Electrical Catalog" reappears. Yosuke closes in on Kihachi, who doubts whether it's the real catalog, and Inako, who believes it is. Kihachi desperately resists with his homemade inventions, but is defeated by the power of steam, and Inako and the catalog fall into Yosuke's hands.
Kihachi sneaks into the Hyakukawa house to find out the truth and learns that Inako is being forced into an unwanted marriage with Yosuke for the sake of the family. Kihachi rescues Inako, who has been locked in the storehouse, but is discovered by Yosuke, who chases after them. Will Kihachi and Inako be able to escape Yosuke, who is after the catalog?

Having captured Kihachi and Inako, Yosuke obtains the "20th Century Electric Catalog." However, the "secret" Yosuke seeks is not found within it. Although Yosuke denies it's a fake, Inako believes that Kihachi's dream and talent are genuine. A dejected Kihachi, by chance, discovers his brother Seiroku's feelings embedded within the catalog. A challenge for Kihachi and his friends, risking their dreams to oppose Yosuke, begins.

Having achieved the electric full moon, Kihachi begins to look forward again. One day, he hears that the wife of a Nishijin weaving shop owner is depressed due to lingering feelings for her deceased husband. Moved by Inako's strong feelings, who also harbors regrets about her deceased mother, Kihachi decides to save the wife with his invention of electricity. What kind of invention of electricity will allow him to communicate with the dead?--!!

A Kyoto Imperial University student, Oshie Ainosuke, who is in love with Suzu, appears before Kihachi and his friends. What catches his eye is an invention from the Electric Catalog that supposedly reveals whether someone is in love with you! Kihachi and his friends reluctantly begin the experiment to encourage Ainosuke. While Inako is excited about the prospect of Ainosuke and Suzu's romance, Suzu's best friend, Kate, has mixed feelings... Can electricity really reveal people's hearts?--!!

Kihachi and his friends visit Mitsuzoe Park at Yosuke's invitation. Provoked by Yosuke, Kihachi agrees to a competition at the inauguration ceremony of the newly built grand hall: Yosuke's performance on a steam pipe organ versus Kihachi's electric performance. Inako overcomes rigorous practice, but her father opposes her participation. Will Kihachi and his friends be able to successfully play their electric music? Yosuke vs. Kihachi and Inako—who will win?--!!