This is the last of the Hetaquest Mads I found. The song is "Baptize" by Yousei Teikoku from Seikon no Quaser (Thank you Hazuki Hatchi!)
This MAD really makes me want to know what happens in Hetaquest with Ludwig!!
Original is here: http://www.nicovideo.jp/watch/sm11542585
I want more Hetaquest MADs T.T
