This episode explains why the title of the series is "Flame of Recca". The things that happened in this short OAV was in the last volume, volume 33, of the tankoubon of Flame of Recca.
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Up to EP 1Your Voice -KIMIKOE-Anime
Up to EP 1One Punch Man: Road to HeroAnime
Up to EP 12Kino no Tabi: The Beautiful World - The Animated SeriesAnime
Up to EP 13My Little MonsterAnime
Up to EP 10Masuda Kousuke Gekijou: Gag Manga Biyori 3Anime
Up to EP 23Garo: Crimson MoonAnime
Up to EP 13Xuan Yuan Sword LuminaryAnime
Up to EP 4Bunny Drop SpecialsAnime
Up to EP 13White AlbumAnime
Up to EP 13Dog DaysAnime
Up to EP 1Urusei Yatsura Movie 1: Only YouAnime