{{MusicArticle
| titlejp     =不死ナル王女ハ真紅ノ冥淵ニテ哂ウ
| titlejprom  =Fushi naru Oujo wa Shinku no Meien nite Warau
| titleen     =Immortal Princess Smiling upon the Scarlet Lake of Eternity
| group       =[[黒夜葬]]
| groupCat    =Kokuyasou
| image       =不死ナル王女ハ真紅ノ冥淵ニテ哂ウ.jpg
| banner      =
| released    =2011-05-08
| convention  =Reitaisai 8
| catalogno   =
| tracks      =2
| length      =07:27
| website     =[http://kokuyasou.verse.jp/r8ep.html Link] (dead)
| illustrator =Rib:y(uhki)
| designer    =Rib:y(uhki)
| arranger    ={{刹那}}
| lyricist    ={{刹那}}
| vocalist    =Rib:y(uhki)
| masterer    =
| producer    =

| description =It features vocal arrangements of themes from ''[[Embodiment of Scarlet Devil]]''.

| tracklist   =
*{{Track|01|{{lang|ja|不死ナル王女ハ真紅ノ冥淵ニテ哂ウ}}|03:50|lyrics=Lyrics: 不死ナル王女ハ真紅ノ冥淵ニテ哂ウ}}
**''Immortal Princess Smiling upon the Scarlet Lake of Eternity''
** arrangement: {{刹那}}
** lyrics: {{刹那}}
** vocals: Rib:y(uhki)
** original title: {{lang|ja|亡き王女の為のセプテット}}
** source: {{EoSD}}

*{{Track|02|{{lang|ja|慧智ノ魔女ガ紡グ七ノ文言}}|03:37|lyrics=Lyrics: 慧智ノ魔女ガ紡グ七ノ文言}}
**''The Witch of Wisdom Spun Seven Words''
** arrangement: {{刹那}}
** lyrics: {{刹那}}
** vocals: Rib:y(uhki)
** original title: {{lang|ja|ラクトガール　～ 少女密室}}
** source: {{EoSD}}
}}

[[es:不死ナル王女ハ真紅ノ冥淵ニテ哂ウ]]