Parallel Worlds are alternate worlds that are filled with different realities. For example, different worlds are filled with various things, such as advanced technology, uncovered ancient civilizations, and medical sciences that can cure diseases known to be incurable in other worlds. One individual, Byakuran, can experience all of his other selves' lives and share their information.
- The theory of Parallel Worlds was first mentioned by Adult Lambo during his fight against Leviathan.
- Irie Shoichi said that he was the cause of Byakuran's power of being able to travel to other worlds awakening.
- Known people that have traveled to different worlds:
- Irie Shoichi
- Irie Shoichi is the only one to travel to other Parallel Worlds by the use of Ten Year Bazooka.