Single mother Ayaka devoted herself to raising her son Ryuta. To her, her relationship with her childhood friend Toru was a secret. But one day, Ryuta discovers their affair. This shocking event deeply shakes Ryuta's emotions, altering the way he sees his mother. He can no longer view her as just a mother, but as a woman, and driven by his desires, he assaults her. Yet, deep inside, his love for his mother still remains. Ayaka, too, finds herself torn by unfamiliar emotions. This is a profound story where the bond between mother and son collides with the turmoil of forbidden desire.