Sekaikei, is a Japanese term, roughly meaning “the motif of the crisis of the world,” is a neologism referring to subcultural works of animation, manga, games and light novels on the combined theme of apocalyptic crisis and romance. It is a work examines the conception of Hiroki Azuma's "Database Animals" and Eiji Otsuka's "Grand Narrative", which responses “imagined communities” by Benedict Anderson. In a sense of contemporary exile/diaspora, probably there is no “nostalgia”, only have “nomadalgia”. Sekaikei is a work explore the “nomadalgia” in digital era and the uncertainty.