Set in Kyoto in 1907, the story follows Inako Momokawa, a girl who clings to faith, and Kihachi Sakamoto, a boy who believes in the future of electricity. To stop an arranged marriage forced on Inako, the two set out across Kyoto and Shiga in search of the strange book Kihachi once wrote, the Electric Catalog.

There is light because someone once lit it. A flight and a love story unfold in Meiji-era Kyoto, where past and future cross.