The Bookstore Between Cause and Effect

There are laws for everything, and there are laws of cause and effect. At the junction of time and space, there is a mysterious bookstore. People who come to the bookstore are looking for answers. People or demons who are confused will occasionally meet rare characters who come to the bookstore. Are you the one who comes to the bookstore for help? A dark and simple door slowly opened, "Welcome to the space between cause and effect, the answers you are looking for are all here."