Sumiko Fukamachi (深町 スミ子 Fukamachi Sumiko) is a side character of Sound! Euphonium: The Movie - Our Promise: A Brand New Day film. She is a new first-year at Kitauji High School who joins the band as a hornist in Kumiko Oumae's second year.
Sumiko is bad at studying that she always gets poor marks on her tests. Even with Aine Kohara instructing her, there's no change in the results.
- Sumiko's surname Fukamachi means "deep" (深) (fuka) and "town, village, block, street" (町) (machi).
- Sumiko's best subject is PE.
|Kitauji High School Concert Band during Kumiko Oumae's second year|
|Note: Section leaders are shown in bold text|