{{MusicArticle
| titlejp     =東方合体ゲンソウオー1.5式
| titlejprom  =Touhou Gattai Gensouoh 1.5 Shiki
| titleen     =Touhou Allied Illusionary War 1.5
| group       =[[5150]]
| groupCat    =5150
| image       =5150_gattai_cover.jpg
| banner      =5150_gattai_banner.jpg
| released    =2010-10-11
| convention  =Touhou Kouroumu 6
| genre       ={{Genre|Vocal}}, {{Genre|Metal}}
| tracks      =4
| catalogno   =
| website     =[http://ryu-5150.jp/gensouoh-1-5/top.html Link]
| length      =20:05
| arranger    ={{龍5150}} 
| vocalist    ={{龍5150}} 
: {{飛鳥}} 
: {{lang|ja|紫}} ([[MiddleIsland]])
| lyricist    ={{龍5150}}
| illustrator ={{飛鳥}} 
| other_staff =
; Guitar & Bass
: {{龍5150}} 
; Key & MIDI Programming
: {{龍5150}} 
; Mixing
: Studio 5150 
| masterer    =Studio 5150 
| description =It features vocal and instrumental arrangements of themes from ''[[Phantasmagoria of Dim.Dream]]'', ''[[Lotus Land Story]]'', ''[[Imperishable Night]]'', ''[[Scarlet Weather Rhapsody]]'', ''[[Undefined Fantastic Object]]'' and ''[[Double Spoiler]]''.

It is like an appendix in nature to ''[[東方合体ゲンソウオー|Touhou Gattai Gensouoo]]'', with tracks 3 and 4 being karaoke versions of tracks from that album. However, tracks 1 and 2 are new.
| tracklist   =

* {{Track|01|Shining Starlight|05:04|lyrics=Lyrics: Shining Starlight}}
** arrangement: {{龍5150}}
** lyrics: {{龍5150}} 
** vocals: {{龍5150}}, {{飛鳥}}, {{lang|ja|紫}}
** original title: {{lang|ja|星の器　～}} Casket of Star
** source: {{LLS}}
** original title: {{lang|ja|感情の摩天楼　～}} Cosmic Mind
** source: {{UFO}}

* {{Track|02|{{lang|ja|烏天狗の歌}}|05:23}}
** ''Song of the Crow Tengu'' 
** arrangement: {{龍5150}}
** original title: {{lang|ja|無間の鐘　～}} Infinite Nightmare
** source: {{DS}}

* {{Track|03|{{lang|ja|限界突破}} (Off Vo)|05:16|lyrics=Lyrics: 限界突破}}
** ''Breaking Through the Barrier''
** arrangement: {{龍5150}}
** original title: {{lang|ja|恋色マスタースパーク}}
** source: {{IN}}
** original title: Reincarnation
** source: {{PoDD}}

* {{Track|04|Battle Burning (Off Vo)|04:22|lyrics=Lyrics: Battle Burning}}
** arrangement: {{龍5150}}
** original title: {{lang|ja|有頂天変 ～}} Wonderful Heaven
** source: {{SWR}}

}}