A widow named Asako, who lost her husband at an early age, grows increasingly anxious about her son's development. The boy remains unnaturally attached to her, unable to wean himself away, and begins making strange, inexplicable demands in their daily life. Asako tries to convince herself it's harmless, secretly indulging in forbidden desires—careful to keep it hidden from everyone. But one day, her actions are accidentally discovered by her son. His behavior quickly turns volatile and aggressive. Asako finds herself pushed further into desperation, ultimately trapped in an uncontrollable, devastating situation.