Story:

In an unknown place where the laws of time and space never exist, that means the creature in this place, and its owner, would have portals in different universes and different eras, from the 90s and 80s to the 2000s and 2010s up to the present. In that animation, there was nothing but darkness and the creature. Okay, let's see, pain, blood, and suffering of mortals brought about by creating other dimensions and universes so they could play these games forever, thus beginning these rounds.