"Taimanin Shiranui: Inyoku no Dorei Shoufu" is a gripping hentai OVA prequel to Taimanin Yukikaze, marking the 10th anniversary of the game. It follows elite anti-demon ninja Shiranui—Mizuki Yukikaze's mother—who vanishes on a covert mission in the underground city of Yomihara and falls into Nomad's clutches. Captured and subjected to brutal sexual training by the "king of whores" Kuroi, she's transformed into a high-class slave prostitute through intense humiliation, public performances, and sensory-enhanced perversion at the Under Eden brothel.