Deep in the Mountains of Japan lies a portal to the Oni World, a world where hideous horned Demons rule, plotting to take over our world. The portal is guarded by Ninjas who used the power of Fire, Lightning, Ice, Earth, and Water. However, a new Oni Portal is opening up, this time in the Canadian Rockes. Kaji 'Kai' Masurao, the Fire Ninja recruits 4 Ninjas of different Races that were adopted by Ninjas and creates the Power Rangers Ninjas!