{{MusicArticle
| titlejp     =こちら秘封探偵事務所 Music Collection 紅魔郷編
| titlejprom  =Kochira Hifū Tantei Jimusho Music Collection Kōmakyō-hen
| titleen     =This is the Secret Sealing Detective Agency Music Collection: Embodiment of Scarlet Devil Arc
| group       =[[オーライフジャパン|{{lang|ja|オーライフジャパン}}]] (O-LIFE.JP)
| groupCat    =O-LIFE.JP
| image       =HFTT-0001.jpg
| caption     ='''Cover Art:''' [[Maribel Hearn]] & [[Renko Usami]]
| banner      =
| released    =2016-08-13
| convention  =Comiket 90
| catalogno   =HFTT-0001
| tracks      =11
| length      =47:28
| website     =[http://longnovel.com/goods/%E9%9F%B3%E6%A5%BDcd%E3%80%80%E3%81%93%E3%81%A1%E3%82%89%E7%A7%98%E5%B0%81%E6%8E%A2%E5%81%B5%E4%BA%8B%E5%8B%99%E6%89%80-music-collection-%E7%B4%85%E9%AD%94%E9%83%B7%E7%B7%A8/ Link]
| genre       = {{Genre|Instrumental}}
| illustrator =
| designer    =
| arranger    ={{まさみティー}}
| lyricist    =
| vocalist    =
| masterer    =
| producer    =
| other_staff =
; Jacket Illustration & Design	
:たんこぶ

| description =It features instrumental arrangements of themes from ''[[Retrospective 53 minutes]]'', ''[[Embodiment of Scarlet Devil]]'', ''[[Changeability of Strange Dream]]'', the ''[[Perfect Memento in Strict Sense (CD)|Perfect Memento in Strict Sense CD]]'' and ''[[Ghostly Field Club]]''.<br>
It was released as a companion CD to the novel [[This is the Secret Sealing Detective Agency: Embodiment of Scarlet Devil Arc]] ({{lang|ja|こちら秘封探偵事務所 紅魔郷編}}) by [[Rhythm Five]].

| tracklist   =
* {{Track|01|{{lang|ja|卯酉東海道「ヒロシゲ」36号の旅}}|03:28}}
** ''The Journey of East-West Tokaido "Hiroshige" No.36''
** arrangement: {{まさみティー}}
** original title: {{lang|ja|ヒロシゲ36号 ～ Neo Super-Express}}
** source: {{R53m}}

* {{Track|02|{{lang|ja|魔女の図書館}}|03:52}}
** ''The Witch's Library''
** arrangement: {{まさみティー}}
** original title: {{lang|ja|ヴワル魔法図書館}}
** source: {{EoSD}}

* {{Track|03|{{lang|ja|吸血鬼と現状分析}}|04:25}}
** ''The Vampire and an Analysis of the Current Situation''
** arrangement: {{まさみティー}}
** original title: {{lang|ja|上海紅茶館　～ Chinese Tea}}
** source: {{EoSD}}

* {{Track|04|{{lang|ja|紅い館の秘密}}|03:50}}
** ''The Scarlet Mansion's Secret''
** arrangement: {{まさみティー}}
** original title: {{lang|ja|メイドと血の懐中時計}}
** source: {{EoSD}}

* {{Track|05|{{lang|ja|そして誰がいなくなったか}}|03:37}}
** ''And Then Who Dissapeared?''
** arrangement: {{まさみティー}}
** original title: {{lang|ja|U.N.オーエンは彼女なのか？}}
** source: {{EoSD}}

* {{Track|06|{{lang|ja|異変は閉ざせし紅の門を}}|04:29}}
** ''The Incident Opens the Sealed Scarlet Door''
** arrangement: {{まさみティー}}
** original title: {{lang|ja|明治17年の上海アリス}}
** source: {{EoSD}}

* {{Track|07|亡き王女の五百年密室|05:46}}
** ''The Dead Princess's 5-Century Sealed Room''
** arrangement: {{まさみティー}}
** original title: {{lang|ja|亡き王女の為のセプテット}}
** source: {{EoSD}}

* {{Track|08|{{lang|ja|幻想郷の基礎論}}|04:17}}
** ''The Foundation of Gensokyo''
** arrangement: {{まさみティー}}
** original title: {{lang|ja|科学世紀の少年少女}}
** source: {{CoSD}}

* {{Track|09|{{lang|ja|解決された異変の記憶}}|05:28}}
** ''Memory of a Solved Incident''
** arrangement: {{まさみティー}}
** original title: {{lang|ja|阿礼の子供}}
** source: {{PMiSS}}

* {{Track|10|{{lang|ja|少女は閉ざされたまま}}|03:23}}
** ''The Girl is Left Shut In''
** arrangement: {{まさみティー}}
** original title: {{lang|ja|ラクトガール　～ 少女密室}}
** source: {{EoSD}}

* {{Track|11|{{lang|ja|こちら秘封探偵事務所}}|04:50}}
** ''This is the Secret Sealing Detective Agency''
** arrangement: {{まさみティー}}
** original title: {{lang|ja|少女秘封倶楽部}}
** source: {{GFC}}
}}