{{MusicArticle
| titlejp     =
| titlejprom  =
| titleen     =Delight Hour e.p.
| group       =[[少女理論観測所|Girls Logic Observatory]] ({{lang|ja|少女理論観測所}})
| groupCat    =Girls Logic Observatory
| groupCat2   =
| groupCat3   =
| groupCat4   =
| released    =2017-09-18
| convention  =Kagaku Seiki no Café Terrace 7
| tracks      =4
| length      =
| catalogno   =SRCD-017
| genre       ={{Genre|Vocal}}, {{Genre|Rock}}, {{Genre|Pop}}
| website     =[https://srcd017dh.tumblr.com/ Link]
| image       =SRCD-017.jpg
| caption     ='''Cover Art:''' [[Renko Usami]]
| banner      =
| arranger    ={{テラ}}
| lyricist    ={{テラ}}
| vocalist    ={{テラ}}
:{{咲子}} ([[_erhm]])
:{{うきね}} ({{lang|ja|心臓を潰して殺せ}}!!, [https://twitter.com/u_ukishima twitter])
| producer    =
| illustrator =; Jacket Design & Illustration
:{{lang|ja|ゐとい}} ([http://108mgmg.blog.fc2.com/ RoA])
| designer    =
| masterer    =
| other_staff =
; Mixing & Mastering
:{{テラ}}

| no_intro    =Y
| description ='''Delight Hour e.p.''' is the 4<sup>th</sup> [[Wikipedia:Dōjin_music|doujin single]] by [[少女理論観測所|Girls Logic Observatory]] ({{lang|ja|少女理論観測所}}) and was released at [[:category:Kagaku Seiki no Café Terrace 7|Kagaku Seiki no Café Terrace 7]] (2017-09-18). It features vocal arrangements of themes from ''[[Magical Astronomy]]'' and ''[[Dateless Bar "Old Adam"]]''.

| tracklist   =

{{F:track|01|{{lang|ja|抽象ディライト}}||lyrics=Lyrics: 抽象ディライト
| english title = Abstract Delight
| arrangement = {{テラ}}
| lyricist = {{テラ}}
| vocals = {{うきね}}
| sources = 
! title: {{lang|ja|バー・オールドアダム}}
! source: {{DBOA}} }}

{{F:track|02|{{lang|ja|サーチアワー}}||lyrics=Lyrics: サーチアワー
| english title = Search Hour
| arrangement = {{テラ}}
| lyricist = {{テラ}}
| vocals = {{咲子}}
| sources = 
! title: {{lang|ja|燕石博物誌が連れてきた闇}}
! source: {{DBOA}} }}

{{F:track|03|{{lang|ja|アンダードッグアンセム}} ver.{{lang|ja|テラ}}||lyrics=Lyrics: アンダードッグアンセム
| english title = Underdog Anthem ver.TERRA
| arrangement = {{テラ}}
| lyricist = {{テラ}}
| vocals = {{テラ}}
| sources = 
! title: {{lang|ja|天空のグリニッジ}}
! source: {{MA}} 
| ref = <ref name="one" />}}

{{F:track|04|Mary Go,Merry Happy Live@{{lang|ja|東方フリークス}}Vol.1||lyrics=Lyrics: Mary Go,Merry Happy
| english title = Mary Go,Merry Happy Live@Touhou Freaks Vol.1
| arrangement = {{テラ}}
| lyricist = {{テラ}}
| vocals = {{咲子}}
| sources = 
! title: {{lang|ja|大空魔術　～}} Magical Astronomy
! source: {{MA}} 
| extra = 
{{F:other|original version from|[[ParallelEnd Observer]]}} }}

| notes       =
== Notes ==
{{Reflist|refs=
<ref name="one">Track 03 "{{lang|ja|アンダードッグアンセム}} ver.{{lang|ja|テラ}}" is a re-recording from the circle's sixth album [[ParallelEnd Observer]] (2016).</ref>
}}
| review      =
| print_references =
}}