After her husband passed away, Misuzu singlehandedly raised her son, Hiroshi. Hiroshi was studying hard to get into medical school, but the tuition was prohibitive. Then, her husband's younger brother, Tomohiro, offered to provide for her if she offered her body to Ozawa, the head of the neighborhood association. For the sake of her son, Misuzu had no choice but to be tied up and played with by Ozawa. One day, however, Hiroshi saw his mother writhing in pleasure as a hemp rope dug into her...