Song Identification Request, Touhou? Does anyone know the name of this song?  I think the base song is from Touhou?  But I can't remember from which game it is.  

I really just need the original song name and I could probably find this particular arrangement, but it'd be great if the circle who made this arrangement was given as well.

Here's the song.
As Gao indicated, the BGM corresponds to （BGM：【DiGiTAL WiNG】Paranoia）as indicated in the video description.

The original song is Koishi Komeiji's Theme - Hartmann's Youkai Girl