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 an work examines the conception of Hiroki Azuma's "Database Animals" and Eiji Otsuka's "Grand Narrative", which respones “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.