Manga Askr Yggdrasil's Wood

Er was banished to a harsh and desolate planet for wrongdoing, where he was forced to hunt monsters for food. However, in one of the gray days, an officer arrives at him, who declares that his exile is over. Upon returning to his home planet, he learns that a hundred years have passed here, and everything in this world has changed a lot. However, why was his link canceled after such a long period of time?