{{MusicArticle
| titlejp     =四季-夏- {{lang|en|Illusion of Sky}}
| titlejprom  =Shiki -Natsu- Illusion of Sky
| titleen     =Four Seasons -Summer- Illusion of Sky
| group       =[[t=NODE]]
| groupCat    =t=NODE
| image       =四季-夏- Illusion of Sky.jpg
| banner      =四季-夏- Illusion of Sky banner.jpg
| released    =2009-08-15
| convention  =Comiket 76
| genre       ={{Genre|Instrumental}}, {{Genre|Vocal}}
| tracks      =12
| website     =[http://www.geocities.jp/jza02611/toku76.html Link] (dead)
| length      =56:02 
| catalogno   =N/A
| other_staff =
; Arrangement
:[[t=NODE]]
:RD-Sounds ([[凋叶棕|{{H:title|凋叶棕|Diao ye zong}}]])
:[[黒夜葬|{{H:title|黒夜葬|Kokuyasou}}]]
:[[As/Hi]]
:[[human error]]
:[[Crazy Voltage]]
:[[Sonic Hybrid Orchestra]]
:[[東部開拓地|{{H:title|東部開拓地|Toubu Kaitakuchi}}]]
; Illustrator
:{{lang|ja|ろまんすの猫狼娘}}
; Producer
:[[t=NODE]]
; Mastering
:[[sound./Ecriture]]

| description =It features instrumental and vocal arrangements of themes from ''[[Perfect Cherry Blossom]]'', ''[[Immaterial and Missing Power]]'', ''[[Imperishable Night]]'', ''[[Phantasmagoria of Flower View]]'', ''[[Mountain of Faith]]'', ''[[Scarlet Weather Rhapsody]]'', ''[[Subterranean Animism]]'' and ''[[Magical Astronomy]]''.

| tracklist   =

*{{Track|01|Illusion of Sky|06:09}}
**arrangement: [[t=NODE]]
**original title: {{lang|ja|霊知の太陽信仰 ～}} Nuclear Fusion
**source: {{SA}}

*{{Track|02|{{lang|ja|緋想天}}-Forbidden Paradise-|05:06}}
**''___''
**arrangement: [[t=NODE]]
**original title: {{lang|ja|緋想天}}
**source: {{SWR}}

*{{Track|03|Imperfect Sight|04:35}}
**arrangement: [[Crazy Voltage]]
**original title: {{lang|ja|永夜の報い ～}} Imperishable Night
**source: {{IN}}

*{{Track|04|{{lang|ja|袖振りあうも鬼の宴～砕月・華のさかづき大江山}}|04:22}}
**''___''
**arrangement: [[東部開拓地|{{H:title|東部開拓地|Toubu Kaitakuchi}}]]
**original title: {{lang|ja|砕月}}
**source: [[Immaterial and Missing Power|{{lang|ja|東方萃夢想 ～}} Immaterial and Missing Power]]
**original title: {{lang|ja|華のさかづき大江山}}
**source: {{SA}}

*{{Track|05|Caution: Overeating & Overdrinking|04:43}}
**arrangement: [[Sonic Hybrid Orchestra]]
**original title: Demystify Feast
**source: {{IaMP}}

*{{Track|06|{{lang|ja|遅い夏に舞う光、ひとつ。}}|04:49}}
**''___''
**arrangement: [[As/Hi]]
**original title: {{lang|ja|蠢々秋月 ～}} Mooned Insect
**source: {{IN}}

*{{Track|07|{{lang|ja|ステンドグラス}}|03:41|lyrics=Lyrics: ステンドグラス}}
**''Stained Glass''
**arrangement: [[Human Error]]
**original title: {{lang|ja|大空魔術 ～}} Magical Astronomy
**source: {{MA}}

*{{Track|08|{{lang|ja|河童のポンコツ浪漫産業革命}}|04:07}}
**''Kappa's Striking Romantic Industrial Revolution''
**arrangement: RD-Sounds ([[凋叶棕|{{H:title|凋叶棕|Diao ye zong}}]])
**original title: {{lang|ja|芥川龍之介の河童 ～}} Candid Friend
**source: {{MoF}}

*{{Track|09|{{lang|ja|輪禍}}|04:41}}
**''___''
**arrangement: [[t=NODE]]
**original title: {{lang|ja|死体旅行 ～}} Be of good cheer!
**source: {{SA}}

*{{Track|10|{{lang|ja|天庭の白百合}}|04:59}}
**''Lily White of the Heavenly Garden''
**arrangement: [[黒夜葬|{{H:title|黒夜葬|Kokuyasou}}]]
**original title: {{lang|ja|天空の花の都}}
**source: {{PCB}}

*{{Track|11|{{lang|ja|羽根}}|02:23}}
**''___''
**arrangement: [[t=NODE]]
**original title: {{lang|ja|懐かしき東方の血 ～}} Old World
**source: {{IN}}

*{{Track|12|Summer Vacation|06:27}}
**arrangement: [[t=NODE]]
**original title: {{lang|ja|今昔幻想郷 ～}} Flower Land
**source: {{PoFV}}
}}