Revisiting old hentai over the last month or so, I happened upon a curious case.
The four-part Y.O.U.C/Digital Works OVA "Love Doll" (alternatively "Ai Doll" or going by the Japanese release kanji, "Mourning Slave (Ai Doll)") is an anomaly in hentai production. Most works of the era are based on some tankoubon or PC-98 game or some other prior non-film work; conversely, Love Doll exists ex nihilo.
But for being immortalized as a cheap-seats offering from HentaiKey and affiliate sites, it seems to have returned to nothing as well: cursory searches of Pixiv have returned not as much as a colored pencil sketch on par with those of dA's usual S