“Haikyu” is like a very detailed version of “Sound Euphonium” S3. There is an untold story of how the captain Sawamura Daichi helped develop a flightless Karasuno High School volleyball team to a national contender in his final year of high school. Sound Euphonium explores Kumiko’s entire school journey as a member of the concert band to her life as their captain. Or maybe, “Sound Euphonium” S3 is like a condensed version of the entirety of “Haikyu”, including the yet-unadapted parts. One can analogize Mayu with either Kageyama or Hinata, the genius newcomers who are the crucial pieces of a powerhouse team. Mayu’s story isn’t told much in Sound Euphonium, but Kageyama and Hinata’s is a central plot of Haikyu.