Cthulhu Shinwa no Maboroshi: Yume Sakai Michinaru Kadath wo Yume ni Motomete

Randolph Carter dreams three times of a majestic sunset city, but each time he is abruptly snatched away before he can see it up close. When he prays to the gods of dream to reveal the whereabouts of the phantasmal city, they do not answer, and his dreams of the city stop altogether. Undaunted, Carter resolves to go to Kadath, where the gods live, to beseech them in person. Source: Wikipedia