Maki raised her son, Ko-suke, all by herself. As he grew up, she decided to remarry the man she was dating... Lately, for some reason, she couldn't stop worrying about Ko-suke. She was puzzled by her own feelings of inappropriate affection towards her son. One day, a letter arrived from the hospital where Ko-suke was born... It stated that Ko-suke was not her biological son. Ko-suke, who had secretly harbored romantic feelings for his mother since childhood, couldn't help but embrace Maki upon learning they were not related by blood.
