consider:

zombiekaiba:

image

  • DSoD opens with a shot of a bunch of different universes swirling around in the multiverse before it zooms in on one of them. The very first statement this movie makes is “this is just one world of many.”
  • The movie features cameos from a couple of manga-exclusive characters (Duke’s father, the mean PE teacher from Monster World), and Kaiba isn’t visible in the ceremonial duel flashback, but it also uses the character designs, voice actors, and general tone and art style from the DM anime. Events exclusive to a single continuity (like Death-T or Doma) are never mentioned.
  • The manga and DM are set during the 90s/early 2000s, but in DSoD the tech jumps from VHS tapes to touch screens and smart phones in the span of what would theoretically be

    only

    a few months.

Conclusion: DSoD isn’t actually set in the manga-verse or the anime-verse. Its basic storyline could work as a sequel to either of them, but the specific world we see in the movie is its own brand-new continuity.