Yuri comes to see how her son is doing after moving to Tokyo for work. Her joy at being relied on by her son gradually changes into love between a man and a woman, and they cross the line between parent and child. A mistake born from a moment of hesitation. Yuri is troubled by the fact that she has entered into an unforgivable relationship. "I know this is wrong. But... I want to be in touch with him once more..." With her love for her son growing stronger and deeper the more they are apart, she goes to see him again this month...