{{MusicArticle
| titlejp     =悠久幻想郷
| titlejprom  =Yuukyuu Gensoukyou
| titleen     =Eternal Gensokyo
| group       =[[efs]]
| groupCat    =efs
| image       =EFS-0012.jpg
| banner      =
| catalogno   =EFS-0012
| tracks      =9
| length      =32:01
| released    =2012-05-27
| convention  =Reitaisai 9
| website     =[http://efs.holy.jp/REI9/efs_ykgk.htm Link]
| illustrator ={{lang|ja|美夢}}
| designer    =cao. ([http://www.petitbrain.com/ *PetitBrain])
| arranger    ={{八神将義}}
| lyricist    ={{阿部左}}
:{{真野綾}} ([http://aya.2-d.jp/ あやみっくす])
:Yummy ([http://com.nicovideo.jp/community/co1184030 やむやむ！])
:{{野瀬冬弥}} ([http://www4.pf-x.net/~winter/ Phonic])
:{{葉山りく}} ([http://www.rikkun.net/ Dolphin Time])
| vocalist    ={{阿部左}}
:{{真野綾}} ([http://aya.2-d.jp/ あやみっくす])
:{{lang|ja|矢吹高音}} ([http://www.voiceblog.jp/yabuki/ 高音の部屋])
:Yummy ([http://com.nicovideo.jp/community/co1184030 やむやむ！])
:{{野瀬冬弥}} ([http://www4.pf-x.net/~winter/ Phonic])
:{{葉山りく}} ([http://www.rikkun.net/ Dolphin Time])
| other_staff =
; Mix & Mastering
:{{八神将義}}

| description =It features vocal and instrumental arrangements of themes from ''[[Embodiment of Scarlet Devil]]'', ''[[Perfect Cherry Blossom]]'', ''[[Imperishable Night]]'', ''[[Phantasmagoria of Flower View]]'', ''[[Mountain of Faith]]'', ''[[Subterranean Animism]]'', ''[[Undefined Fantastic Object]]'', ''[[Fairy Wars]]'' and ''[[Ten Desires]]''.
| tracklist   =

* {{Track|01|{{lang|ja|赤色の肖像}}|04:01|lyrics=Lyrics: 赤色の肖像}}
** ''Red Portrait''
** arrangement: {{八神将義}}
** lyrics: {{阿部左}}
** vocals: {{阿部左}}
** original title: {{lang|ja|亡き王女の為のセプテット}}
** source: {{EoSD}}

* {{Track|02|Mind　Fortune|04:06|lyrics=Lyrics: Mind　Fortune}}
** arrangement: {{八神将義}}
** lyrics: {{真野綾}}
** vocals: {{真野綾}}
** original title: {{lang|ja|感情の摩天楼　～}} Cosmic Mind
** source: {{UFO}}

* {{Track|03|Jealousy chain|04:11|lyrics=Lyrics: Jealousy chain}}
** arrangement: {{八神将義}}
** lyrics: {{真野綾}}
** vocals: {{矢吹高音}}
** original title: {{lang|ja|緑眼のジェラシー}}
** source: {{SA}}

* {{Track|04|Dark Cherry|02:15}}
** arrangement: {{八神将義}}
** original title: {{lang|ja|死霊の夜桜}}
** source: {{TD}}

* {{Track|05|wait for the RAIN|04:00|lyrics=Lyrics: wait for the RAIN}}
** arrangement: {{八神将義}}
** lyrics: Yummy
** vocals: Yummy
** original title: {{lang|ja|少女が見た日本の原風景}}
** source: {{MoF}}

* {{Track|06|{{lang|ja|語り継ぐ者}}|03:51|lyrics=Lyrics: 語り継ぐ者}}
** ''___''
** arrangement: {{八神将義}}
** lyrics: {{野瀬冬弥}}
** vocals: {{野瀬冬弥}}
** original title: {{lang|ja|プレインエイジア}}
** source: {{IN}}

* {{Track|07|Absorption|02:25}}
** arrangement: {{八神将義}}
** original title: {{lang|ja|遠野幻想物語}}
** source: {{PCB}}

* {{Track|08|Carnival!|03:33|lyrics=Lyrics: Carnival!}}
** arrangement: {{八神将義}}
** lyrics: {{lang|ja|真野綾}}
** vocals: {{lang|ja|矢吹高音}}
** original title: {{lang|ja|年中夢中の好奇心}}
** source: {{FW}}

* {{Track|09|secret break|03:34|lyrics=Lyrics: secret break}}
** arrangement: {{八神将義}}
** lyrics: {{葉山りく}}
** vocals: {{葉山りく}}
** original title: {{lang|ja|フラワリングナイト}}
** source: {{PoFV}}

}}