Two boys, whose parents ply their trade by the mouth of a muddy river in Osaka, become close friends.
Young Kinu Yamabe is drawn to low-born Onimaru, who is vital and charismatic, but viewed by his father as a demon. After her first period, Kinu suffers the fate of any women born near the Sacred Mountain: she must leave the Mountain and serve as a priestess.
A young woman who escaped from prison is eventually captured and brought back. The evil warden decides to make her a pet project and tries to break her down with torture, gang rape and by turning her friends against her.
