So... is Show By Rock!! finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Show By Rock!!
SHOW BY ROCK!!（ショウ・バイ・ロック!!）
Anime - Base
Release date: April 05, 2015
Show By Rock!! #
Show By Rock!! 2
Anime - Sequel
Release date: October 02, 2016
Synopsis
Show By Rock!! tells the story of Cyan, an ordinary girl with hidden musical talent who gets transported to Midi City, a world powered by music.
In Midi City, musicians wield incredible influence, but a dark force threatens to corrupt the city's sound and plunge it into darkness.
Cyan, along with her newfound bandmates Chuchu, Retoree, and Moa, must learn to harness her own powerful musical abilities to fight back against this looming threat and protect the vibrant world of Midi City.
It's a journey of self-discovery and musical battles, as Cyan confronts her insecurities and rises to the challenge of becoming a true rock star.