Holding her newborn son and breastfeeding him, housewife Mona feels pure happiness. However, the sensation of her baby sucking her nipples triggers intense physical reactions, immersing her in waves of pleasure and torment that contrast sharply with her otherwise peaceful daily life. One day, her neighbor Yokoyama discovers her in the midst of nursing. Startled and embarrassed, Yokoyama tries to flee, but seeing his reaction, Mona can no longer suppress her desires and calls him back.