Haruna Hosono

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 an alto saxophonist in Kumiko Oumae's second year.
== Etymology ==
* The name Haruna means "warm/warmth" (暖) (haru) and "apple tree" (奈) (na). 
* Haruna's surname Hosono means "fine, dainty, get thin, taper, slender, narrow" (細) (hoso) and "field, wilderness" (野) (no). 
== Trivia ==
* Haruna is the biggest eater of the band who would nonchalantly eat forever and other people think that she can't be stopped. 
** She is also good at cooking, so thinking about making a menu with large portions for her brings her intolerable levels of happiness. 
== Gallery ==
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Category:Saxophonists
Category:Characters
Category:New Members
Category:Kitauji High School
Category:Concert Band Members
Category:Alto Saxophonists
Category:Female
Category:First Years
Category:Woodwind Players