I'd say it's based on both. The first line is basically identical to the first line of the Goethe poem (Röslein auf der Heiden, since no one has mentioned it yet - sometimes also called Heidenröslein), and that connection is probably the first thing that comes to mind for anyone who knows of the poem. The flow of the story in the song itself is very typical of German literature - allowing for Rammstein's twisting everything :P - though offhand I don't recall which Grimm story, if any, the song could claim as inspiration. But if you ever read any of the original Grimm stories (and not the Disney/etc versions), you'll see that screwy ideas like the song and the video are rather common.
Does anyone know the specific Grimm story that this song borrows from? (if any)
I'd say it's based on both. The first line is basically identical to the first line of the Goethe poem (Röslein auf der Heiden, since no one has mentioned it yet - sometimes also called Heidenröslein), and that connection is probably the first thing that comes to mind for anyone who knows of the poem. The flow of the story in the song itself is very typical of German literature - allowing for Rammstein's twisting everything :P - though offhand I don't recall which Grimm story, if any, the song could claim as inspiration. But if you ever read any of the original Grimm stories (and not the Disney/etc versions), you'll see that screwy ideas like the song and the video are rather common.
Does anyone know the specific Grimm story that this song borrows from? (if any)