Biography
CLOSED/UNDERGROUND is Doujin group name under 片霧烈火 (Katakiri Rekka), (KURO-AN as she calls group herself) which she founded in 2002.
She mainly performs theme songs and insert songs for doujin products with this group name.
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Official twitter: https://twitter.com/CLOSEDUNDGROUND
Biography text from Last.fm, available under CC BY-SA.