Yumi lived a quiet life, always worrying about her son Yuta. When she learned that her son had made a popular, well-behaved friend named Atsushi, she felt a bit relieved. However, Atsushi had his eyes on Yumi and planned to get close to her in order to threaten Yuta. Driven by his desire to sexually possess and steal Yumi away, Atsushi gradually spiraled out of control. Thinking of her son, Yumi endured the humiliation and resisted Atsushi's advances. Yet, throughout this ordeal, her body was increasingly subjected to Atsushi's brutal domination...