Is this Penicillin album still popular among J-Rock fans?

Yes, as a 2014 release in the J-Rock genre, "瑠璃色のプロヴィデンス" maintains a dedicated following.

What style of music is "瑠璃色のプロヴィデンス"?

It is categorized as Rock, specifically fitting within the J-Rock style.

The track "瑠璃色のプロヴィデンス" was released in the year 2014.

Name: Penicillin - 瑠璃色のプロヴィデンス
Brand: Penicillin

Rock

Rock · 2014

Year · 2014Genre · RockStyle · J-Rock

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Is this Penicillin album still popular among J-Rock fans?: Yes, as a 2014 release in the J-Rock genre, "瑠璃色のプロヴィデンス" maintains a dedicated following.
What style of music is "瑠璃色のプロヴィデンス"?: It is categorized as Rock, specifically fitting within the J-Rock style.
When was this specific release made?: The track "瑠璃色のプロヴィデンス" was released in the year 2014.