And here's the yanderoids! (Nem never ceases to surprise me.) By the way, märchen is German for fairy-tale.
Official NND Upload: http://www.nicovideo.jp/watch/sm21415637
Title: メルヘン彼氏とメルヘン彼女 (Meruhen Kareshi to Meruhen Kanojo)
■Music&Lyrics: Nem→mylist/11859415
■PV: Sakuma (サクマ)→mylist/25063133
■Guitar: [TEST]→mylist/2779693
■Encode: ke-sanβ→mylist/14639164
■offvocal→http://nemiu.com/marchen.zip
■Nem's Utattemita→mylist/14963284
■Nem's Music, Etc.→mylist/22733653