Shouya Ishida starts bullying the new girl in class, Shouko Nishimiya, because she is deaf. But as the teasing continues, the rest of the class starts to turn on Shouya for his lack of compassion. When they leave elementary school, Shouko and Shouya do not speak to each other again... until an older, wiser Shouya, tormented by his past behaviour, decides he must see Shouko once more. He wants to atone for his sins, but is it already too late...?

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...