A documentary recording girls who declared, "Please train me to be your anal sex slave," as they are forbidden from any form of excretion and forced into the role of human fecal receptacles, subjected to extreme sexual servitude. This installment features ten genuine female masochists sharing firsthand accounts of their training experiences. In PART 4, the story focuses on a girl named Natsumi, who is forced into sexual acts while completely covered in feces.