Mirai Sezaki (瀬崎 未来 Sezaki Mirai) is a character from the spin-off novel. She is a third-year trombonist and the trombone section's leader of Rikka High School Concert Band.


  • According to the official Sound! Euphonium novel website,
    • Her special interest in jogging.
    • Her special skill is horse riding.
    • She likes salmon and the sea.
    • She dislikes red caviar (salmon roe) and mirrors.
  • It is possible that Mirai is the girl who is seen talking with Azusa in Episode 5 of Season 2.


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