A serious problem lurking within a married couple: the husband's sperm count is extremely low, making natural pregnancy almost impossible. The financial burden of fertility treatments weighs heavily on them, and under the stress, the husband becomes reckless, growing increasingly harsh toward his wife, Tsubaki. Then, Tsubaki is approached by Ohshima, the head of their neighborhood association. At a community meeting, she is subjected to an outrageous, humiliating act under the guise of "fertility treatment." Yet, she finds herself drawn to the strange pleasure and intense stimulation she never experienced in her ordinary married life. Gradually, Tsubaki's body and mind are pulled deeper into this seduction.