Idea of rule based upon (social) contract is present in theory since ancient period until modern times. In this text the authors tend to reveal theory of social contract in a part of Middle Ages. pointing to certain thinkers who contributed to the theory of social contract in their works. They examine some basic elements of developed social contract theory in 18th century. https://www.roneverhart.com/Tokidoki-X-Hello-Kitty-and-Friends-1-Blind-Box/