Sayumi, living an ordinary life with her husband and college student son. One day, she accidentally gets seen by her son in the toilet without locking the door. She didn't care at all, but from that moment on, her son started to see his mother as a woman... Then, one hot summer night, unable to resist the sight of his mother in light clothing, he finally pushes her down and rapes her. Since then, an abnormal relationship between mother and son has begun...
