Masah is a spoiled boy who often asks his mother to sleep beside him, yet he is fully aware of her as a woman. He intends to support his mother in place of his late father. However, the family's peace is suddenly shattered. His mother, Sawako, overwhelmed by emotional and physical loneliness, invites her son Masah into the bath. When she touches his groin, the feelings both have long suppressed can no longer be contained and erupt uncontrollably.