Kuberag Arena Anime Details and Episodes A promotional webtoon for the mobile game "Ragnarok Arena". Ran and Maruna fall into the world of Ragnarok Arena! Their special monster collection begins! Series info · Watch free · Trending anime · Airing schedule FormatMangaStatusFinishedSourceOriginalCountryKorea Fantasy Advertisement · Crossover · Full Color Kubera (Shared Characters) Kubera Ran Sairofe · Maruna