__Instrument:__Clarinet and E♭ Clarinet
Maina Kase is a third-year student at Kitauji High School in the main series when Kumiko is a first-year. Kase has long purple hair which curves outwards as it reaches just past her shoulders, along with a fringe. She has short stubby eyebrows, and wears round, purple-framed glasses with light-blue tinted lenses which obscures her eyes, so it is unknown what eye color she has since they have never been seen. Not much is known about Maina's personality, but she is quite close with Chieri Takahisa.

With another tournament fast approaching, Kumiko's band is doubling down on practice and discipline, leaving little time for sleep or other recreational activities. The redoubled practice schedule brings Kumiko and Reina closer together, but elsewhere in the band, it seems like drama threatens to tear the group's unity apart. The ghost of the prior year's mass band exodus still haunts many of Kumiko's classmates, and with former band member Nozomi Kasaki now asking to return, it seems like the grudges of the past will soon be impossible to ignore. 

(Source: Anime News Network, edited)

 
Note: The first episode aired with a runtime of ~48 minutes as opposed to the standard 24 minute long episode.

Spring in the first year of high school. Kumiko, a member of the brass band in junior high school, visits the high school brass band club with classmates Hazuki and Sapphire. There, she comes across Reina, her former classmate from junior high. Hazuki and Sapphire decide to join the club, but Kumiko can’t make up her mind. She recollects her experience with Reina at a competition in junior high school. 
 
(Source: Pony Canyon USA)