Yumi raised her son Kosuke on her own. As he grew up, she began to feel feelings for him, not as a mother, but as a man, and this confused her. Then her husband, who had left her 12 years ago, returned. She brought evidence that Kosuke had been switched with another child at the hospital and urged them to get back together, but Kosuke accidentally found out the truth. Kosuke was devastated that the bond between father and son would be lost. But Yumi embraced him tenderly...