Miki Katou (加藤 樹 Katō Miki) 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 clarinetist in Kumiko Oumae's second year.
Miki is a beginner, so she's practicing the “mysterious steps” for Sunrise Festival. When she struggles with the difficult step movements, the tubist Hazuki Katou gives her individual tutoring. Because of that, she's become attached to her.
- The name Miki means "tree" (樹).
- Miki's surname Katou means "add, increase" (加) (ka) and "wisteria" (藤) (tou).
- Even though Miki has the same surname as Hazuki Katou, they both have no familial relation with each other.
|Kitauji High School Concert Band during Kumiko Oumae's second year|
|Note: Section leaders are shown in bold text|