{{MusicArticle
| titlejp     = 蒼穹永幻奇環
| titlejprom  = Soukyuu Eigen Kikan
| titleen     = Eternal Blue Sky of Fantasy
| group       = [[AIR WINDOW]]
| groupCat    = AIR WINDOW
| released    = 2008-08-16
| convention  = Comiket 74
| tracks      = 6
| length      = 21:54
| catalogno   = ADC0803
| genre       = {{Genre|Instrumental}}, {{Genre|Electronic}}, {{Genre|Trance}}, {{Genre|Classical}}, {{Genre|Techno}}, {{Genre|Rock}}
| website     = [http://airwindow.net/music2008.htm Link]
| digital     = 
| image       = ADC0803.gif
| banner      = 
| banner_res  = 
| caption     = 
| arranger    = Tarau
: makoto
: occhii
| lyricist    = 
| vocalist    = 
| producer    = 
| illustrator = {{lang|ja|画师}}
| designer    = {{lang|ja|设计师}}
| masterer    = 
| other_staff = 
| description = It features instrumental arrangements of themes from ''[[Perfect Cherry Blossom]]'', ''[[Phantasmagoria of Flower View]]'', ''[[Shoot the Bullet]]'' and ''[[Mountain of Faith]]''.
| tracklist   =

* {{Track|01|{{lang|ja|黒桜の宴}}|03:17}}
** ''Feast of Black Cherry Blossoms''
** arrangement: Tarau
** original title: {{lang|ja|幽雅に咲かせ、墨染の桜　～}} Border of Life
** source: {{PCB}}

* {{Track|02|{{lang|ja|堕ちる幻響}}|05:25}}
** ''Falling Illusions''
** arrangement: makoto
** original title: {{lang|ja|今昔幻想郷　～}} Flower Land
** source: {{PoFV}}

* {{Track|03|{{lang|ja|鬱欝蔚}}|02:29}}
** ''Impressive Depression''
** arrangement: occhii
** original title: {{lang|ja|ネイティブフェイス}}
** source: {{MoF}}

* {{Track|04|Necro Fantasyque|02:32}}
** arrangement: Tarau
** original title: {{lang|ja|ネクロファンタジア}}
** source: {{PCB}}

* {{Track|05|{{lang|ja|幻想の丘}}|03:28}}
** ''Hill of Illusions''
** arrangement: occhii
** original title: {{lang|ja|フォールオブフォール　～ 秋めく滝}}
** source: {{MoF}}

* {{Track|06|{{lang|ja|月夜之胎動}}|05:18}}
** ''Moonlit Fetal Movement''
** arrangement: makoto
** original title: {{lang|ja|レトロスペクティブ京都}}
** source: {{StB}}

}}