Kyosuke, a son, lives with his father, Kunio. His mother has decided to separate from him due to Kunio's affair. Worried about living with just the two of them, his mother's younger sister, Rie, comes to help with the housework. Kyosuke is transfixed by Rie, who does the housework in a defenseless manner. Noticing his passionate gaze, Rie smiles. That night, Kyosuke learns a shocking truth. Kunio's affair partner is Rie. Kyosuke, who is secretly peeking into their affair, accidentally meets Rie's eyes as she violently shakes her hips...