Seiko Ashida

Seiko Ashida (芦田 聖子) 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.

Taku Imura
Seiko gets along well with fellow clarinetist Taku where they always laughing together.

Etymology

 * The name Seiko means "holy" (聖) (sei) and "child" (子) (ko).
 * Seiko's surname Ashida means "" (芦) (ashi) and "field, rice paddy" (田) (ta/da).

Trivia

 * Seiko recently became a fan of a South Korean female idol group.