Rob and Chris learn about Shinto and the way of the Samurai. Feeling the pressure from other religions entering and spreading throughout Japan, the Japanese ban together and declare themselves Japanese, er, Shinto. Fed up with all the outsiders coming into Japan, the Samurai and the warrior code, Bushido, play a prominent role in the development of feudal Japan which was great for nationalism but terrible for Japanese police television dramas. Shinto temples are popular tourist attractions even though no one is allowed to go inside.
TLDR: Make Japan great again!
