Hina, a mother who lost her husband two years ago, lives with her son. She moves around a lot for work, and her son has a hard time making friends. One day, her son brings a friend named Yuji home. Hina is happy that her son has a new friend, but Yuji is aroused by Hina beauty and sexy body, and rapes her without her son noticing... Yuji becomes more and more aggressive as Hina doesn't resist for her son's sake...