In ancient times a sentence 'Sukunahikona no Mikoto went over to Misaki in Kumano and at last reached Tokoyo no kuni (parallel universe beyond the sea)' in the volumes of divine age of "Chronicles of Japan" shows that there is a bridge between this and the next world.
古くは『日本書紀』神代巻上で「少彦名命、行きて熊野の御碕に至りて、遂に常世国に適（いでま）しぬ」という他界との繋がりがみえる。