Single mother Mayumi has been raising her only son, Masashi. Lately, she's been worried about Masashi's strange behavior. No matter how much she tries to talk to him, he won't say anything. Just then, a friend of Masashi's shows her a shocking video of him. The friend threatens that if she doesn't keep quiet, Masashi's situation will become dire, and under the condition that she tells no one, Mayumi accepts his sexual demands. From there, Mayumi and Masashi begin their descent…
