Naedoko Demon's Ground: Naraku no Haramihime The Animation.

Leroux went missing after heading to the capital. After some time, her cousin Eliza and her wolf familiars went out to look for her. They learned that she went into a cave in search of tamable monsters and followed her there. After entering, they found a girl named Jard bound up and violated... To their horror, they discovered the Akurem Knights, who capture female adventurers and offer them to monsters as human seedbeds... and they were next...