Samurai- A samurai is a member of a powerful warrior class in Japan. Samurai had great armor and weapons They had to train for the military, practice writing, literature, and spiritually train themselves. The samurai had to follow the Samurai Code called Bushido where they must promise to be, honest, fair, and fearless in the face of death. The samurai were the warriors of Japan and defended their people. Without them, people would have no one to protect them.
Religion- (Shinto) Shinto was a Japanese religion that expressed love and respect for nature. Shinto stresses purifying unclean things. (Buddhism)The Japanese religion called Buddhism sees life as full of pain and suffering. To escape the endless cycle of birth, death, and rebirth, you must follow a moral code (Eightfold Path) that shows respect for others, acting right, and meditation. Both Shinto and Buddhism kept structure because people devoted their lives to religion and based it around their daily lives. Without it, people would not have ways of life that they believed they needed to follow.
Feudalism/Feudal System- Japan had a feudal system where the important people with more power were on top and poorer people with less power were at the bottom. The top positions in order were Emperors, Shogun, Daimyos, and Samurai. The lowest were peasants, artisans, and merchants. This custom made their entire society organized so people would mainly interact with people in their ass or one above or below them. Society would be different without it because people would not have social ranks and most likely would go against each other.