Yoko (Himesaki Shuri) is offered a job opportunity by the director of the children's home, "Shirakaba no Ie," where she grew up. She is told the company requires initial overseas training, and decides to join the program together with her close friend Rika (Ryoko Mizusaki). However, they are thrust into a far harsher environment than they ever imagined. This training becomes not only the beginning of a new life for them, but also the gateway to hell.