In many anime series, the concept of parallel universes is often portrayed as alternate realities or timelines that exist alongside the main storyline. These parallel universes can feature different versions of the characters, alternate outcomes of events, or entirely new worlds with unique rules and settings. The idea of parallel universes is explored to add complexity to the plot, introduce new challenges and conflicts, or to showcase the impact of different choices and actions. Overall, the portrayal of parallel universes in anime can vary greatly depending on the specific series and its themes.