In an alternate version of the early 20th century where technological progress evolved along a different path shaped by steam power, Kyoto is blanketed in constant smoke. A boy, hardened by the loss of his brother, grows distrustful after their shared dream of an Age of Electricity is cut short. A deeply devout girl hides her dreams and regrets for her deceased mother deep within her heart. When the two cross paths, they set about exploring the secrets of the 20th Century Electrical Catalog, a glimpse into the future they long for. Together, they must confront their pasts and carve a path toward the future they once believed in. (Source: Press Release)

Aimless daydreaming in high school is an ordinary part of growing up. But once graduation comes, suddenly there are bills to pay and a higher education to tackle. Even so, Midori Nagumo never quite stopped dreaming—even after entering college—as she still wants to have fun while ignoring her responsibilities. Contrasting Midori's recklessness is her supposed best friend Niikura, who is the complete opposite of Midori and has a goal of becoming a photographer after college. However, Niikura is often pulled into Midori's schemes, which leads them to meet Wako Izumi, a tenacious, yet airheaded classmate who is always taking pictures of things she finds fun. The trio ends up living together in the same apartment and attempt to navigate their lives in the city of City, where unexpected and out-of-the-ordinary things occur daily.

With the ensemble contest behind them, the members of the Kitauji High School concert band now aim to win a gold medal at the national competition. For third-year club president Kumiko Oumae and her friends, it is their last chance before graduation. Filled with anticipation and anxiety, Kumiko worries if she can successfully lead the band. Amid her struggles, Kumiko encounters transfer student Mayu Kuroe. From her gentle demeanor to her talented euphonium skills, Mayu was a member of the Seira Girls' School concert band—a regular at nationals. While Mayu is friendly, Kumiko cannot help but have an indescribable feeling from their meeting. As new members arrive and plans are set in motion, the club, with an insatiable hunger for a gold medal, learns what it truly takes to propel themselves to reach the national level.

The protagonist visits Uji and tours the town, which has been shaped by the accumulation of history and culture from various eras, including the Heian period. (Source: Official Site)