Labyrinth of Touhou BGM - Serious Atmosphere
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Published on ● Video Link: https://www.youtube.com/watch?v=2b2-V69Nf24
This theme is a royalty-free composition.
Plays during the second part of the 12F cutscene after beating Eientei.
Original name: 天邪鬼住まう島-Amanojaku Sumau Sima-
Composer: Rengoku Teien (煉獄庭園)
Full archive of their music: https://archive.org/details/rengoku-teien
Background artist: あすとら
Source: https://www.pixiv.net/en/artworks/55041769