Onii-chan wa Taimanin ni Natte mo Oshimai | Big Brother Became an Anti-Demon Ninja but He’s Still Doomed is a hentai manga (doujinshi) listed in the Top Hentai catalogue. This manga is created by Nekono Matatabi. Genres include: Anal, Anal Intercourse, Double Penetration, Gender Change, Goblin. Featuring characters: Mahiro Oyama. Part of the Onii-Chan Wa Oshimai series. Browse related titles by the same artists, genres and characters below.