The Panther's Cage: Sacrificial Orgy (2009)

Keiko, a writer who is in a slump, goes for a walk and meets Claire. Claire, who is studying abroad from France and is an anthropology researcher, says that in ancient society there was a custom of welcoming strangers by giving them something precious, and sometimes the bodies of their wives and daughters were offered to travelers. He has a personal theory that by offering his body to others, he can discover a new version of himself...