R20 Anime Details and Episodes In Route 20 people live in a metal city surrounded by a glass dome, that protects its inhabitants from the polluted air of the outside, and controlled by… Series info Watch free DetailsFormatMangaStatusFinishedScore61/100SourceOriginalCountryJapan GenresDramaSci-Fi TagsSeinenPost-Apocalyptic RelatedR20: Ginga Kuukou (Source) CharactersAkagi Utsuo