That manga was the first of Giba-chan's manga I read, and I don't know... calling it a rape fetish manga is a little harsh. That manga is entirely about the recovery and rehabilitation of the elf following her capture and... well... all the rape.
It is questionable though that they actually did draw the prequel (the actual elf rape manga). Could have just... not, but... oh well. I'm sure someone read it. I couldn't, as a result of how much I liked the elf and given the severity of her wounds in the actual series...