It seems there might be a misunderstanding in your statement. Shinto is indeed the indigenous spirituality of Japan, characterized by its rituals, beliefs, and practices centered around kami (spirits or deities) and the relationship between humans and nature.
On the other hand, Juche is a political ideology developed in North Korea, primarily associated with Kim Il-sung and the country's leadership. It emphasizes self-reliance and national sovereignty, and while it has cultural elements, it is not a religion in the traditional sense and is not related to Japan.
If you would like to know more about either Shinto or Juche, feel free to ask!