 The Eternal World is a place similar to the afterlife where a person 's " other self " awaits . Anyone can access it , though it is only accessible once one has lost his or her grounding in the real world . It may be necessary to form a pledge with someone in the real world as a guide to the Eternal World , but one 's memories surrounding the pledge become vague . A grace period can be granted between when the pledge is made and when someone goes to the Eternal World . Once the process has started , nothing can prevent someone from going to the Eternal World , and returning to the real world is difficult . Someone about to leave to the Eternal World starts to be forgotten approximately one week before going , and the amount of time before someone forgets differs based on how much someone thinks about the person leaving . However , he or she is remembered the moment that person returns . If a strong emotional bond is established in the real world before leaving , a person in the Eternal World can be returned after approximately one year . 
