{{MusicArticle
| titlejp     =
| titlejprom  =
| titleen     =66 -Sixty Six-
| group       =[[C-CLAYS]]
| groupCat    =C-CLAYS
| groupCat2   =
| groupCat3   =
| groupCat4   =
| released    =2015-08-14
| convention  =Comiket 88
| tracks      =8
| length      =33:11
| catalogno   =TOCD-0052
| genre       ={{Genre|Vocal}}, {{Genre|Instrumental}}, {{Genre|Electronic}}, {{Genre|Pop}}, {{Genre|Rock}}
| website     =[http://www.c-clays.com/work/66/ Link]
| image       =TOCD-0052.jpg
| banner      =
| arranger    ={{あとぐる}}
:{{lang|ja|けぇぽん}}
:W*M
:K2
| lyricist    ={{小峠 舞}}
:W*M
:{{天音未優}}
| vocalist    ={{小峠 舞}}
; Chorus (Track 01)
:{{あとぐる}}
:W*M
| producer    ={{lang|ja|チーム小峠}}
; Executive Producer
:{{綾瀬 孝}}
| illustrator ={{植田亮}} ([http://fancyfantasia.jp/ FancyFantasia])
| designer    =[http://winfanworks.com/ WINFANWORKS]
| masterer    =
| other_staff =
; Guitar (Tracks 02, 07)
:{{鋼鉄兄貴}}

| description =It features vocal and instrumental arrangements of themes from ''[[Imperishable Night]]'', ''[[Phantasmagoria of Flower View]]'', ''[[Mountain of Faith]]'', ''[[Subterranean Animism]]'' and ''[[Hopeless Masquerade]]''.

| tracklist   =

*{{Track|01|{{lang|ja|幻想郷の夏祭り}}|04:20|lyrics=Lyrics: 幻想郷の夏祭り}}
**''Gensokyo Summer Festival''
**arrangement: {{あとぐる}}
**lyrics: {{小峠 舞}}
**vocals: {{小峠 舞}}
**chorus: {{あとぐる}}, W*M
**original title: {{lang|ja|幻想郷の二ッ岩}}
**source: {{HM}}

*{{Track|02|66|04:06|lyrics=Lyrics: 66}}
**arrangement: {{あとぐる}}
**lyrics: {{小峠 舞}}
**vocals: {{小峠 舞}}
**guitar: {{鋼鉄兄貴}}
**original title: {{lang|ja|亡失のエモーション}}
**source: {{HM}}

*{{Track|03|The Color of Envy|03:39}}
**arrangement: {{lang|ja|けぇぽん}}
**original title: {{lang|ja|今昔幻想郷　～}} Flower Land
**source: {{PoFV}}

*{{Track|04|PSYCHEDELIC|04:53|lyrics=Lyrics: PSYCHEDELIC}}
**arrangement: {{あとぐる}}
**lyrics: {{小峠 舞}}
**vocals: {{小峠 舞}}
**original title: {{lang|ja|狂気の瞳　～}} Invisible Full Moon
**source: {{IN}}

*{{Track|05|Water Lily and Trust|04:04}}
**arrangement: {{lang|ja|けぇぽん}}
**original title: {{lang|ja|芥川龍之介の河童　～}} Candid Friend
**source: {{MoF}}

*{{Track|06|{{lang|ja|イキナリナリキリキリキリマイ}}|03:52}}
**''Suddenly going round and round and round and round ''
**arrangement: W*M
**original title: {{lang|ja|華のさかづき大江山}}
**source: {{SA}}

*{{Track|07|Trancemasque|03:47|lyrics=Lyrics: Trancemasque}}
**arrangement: K2
**lyrics: W*M
**vocals: {{小峠 舞}}
**guitar: {{鋼鉄兄貴}}
**original title: {{lang|ja|ハルトマンの妖怪少女}}
**source: {{SA}}

*{{Track|08|♡LOVER|04:30|lyrics=Lyrics: ♡LOVER}}
**arrangement: K2
**lyrics: {{天音未優}}
**vocals: {{小峠 舞}}
**original title: {{lang|ja|ラストリモート}}
**source: {{SA}}

| notes       =
| review      =
| print_references =
}}