This episode is a sidestory and can be inserted somewhere between episodes #18 and #21. This is a "mystery" and so the present writer does not tell the whole story. The Janus is sailing towards Taut when something unexpected happens.
Genres: Action, Adventure, Mecha, Sci-Fi
Watch Ginga Hyouryuu Vifam: Kieta 12-nin episode 1 online — subbed and dubbed, with automatic AniList / MyAnimeList progress sync.