The Scientist World (translation meaning for "Seken no Kagakusha") is a world of scientists and philosophers with immense potential to learn and discover any amount of knowledge and creating any technology that's successed their trails inhabited by humans.
They specialize in chakra flow, konbijutsu, and jikukan ninjutsu and have a great affinity for Solar Style.
Most of this world's beginnings and early histories are unknown
A century ago before the start of the current story, the Hollow Axis began their long invasions in the Scientist World, speading their destruction across the world as they began their long battle against the humans. As the menos-class Hollows advanced to the hemisphere, they slain the modern lords of five nations as they claim victory over the humans. Somehow, the Scientist World decided to create mutliverse-base space-time technology to visited other humans from different worlds (due to they were also in combat against the Hollow Axis) combine their technology & combatant skills together and united their worlds' forces to become the Human Allies.