DESCRIPTION:
[HD 1080p]
Title: The Dark Ruler
Artist: Neo
Circle: Tutti Sound
Album: 東方映画音楽選 - TOHO FILM MUSIC SELECTION～ 紅幻奏詩 "Poetry of Red Phantom"
Theme: Touhou Project
OST title: "UN Owen Was Her?" by ZUN

Also known as Scarlet Phantom Poetry - The Dark Ruler. Orchestral arrangement by Tutti Sound.

The "Sister of the Devil" as the EXTRA stage boss of Embodiment of Scarlet Devil makes her way as having the best arrangement in the album.

-THE DARK RULER Album：東方映画音楽選 - TOHO FILM MUSIC SELECTION
～ 紅幻奏詩 Circle：Tutti Sound -

Wallpaper: http://jaehito.deviantart.com/art/Touhou-Project-Flandre-Scarlet-Ailes-Wallpaper-289308943
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As a deserving theme, a trivia about it. Musical arrangements regarding Touhou Project has been given the title "Crowing Music of Awesome" of all time by every person who loved it, and has been ranked as being the best of the best of THE BEST. 

Fun fact: simply Googling "crowning music of awesome" (with or without quotes) will lead you to ITS PAGE as one of the top three results.