Mika doted on her son, Yutaka, and Yutaka was also brought up by his kind mother. Even now that Yutaka has become a salaried worker, whenever he feels uneasy, he sleeps in the same bed with Mika and is comforted by a gentle kiss. One day, Yutaka decides to go on a business trip abroad. Mika, who regrets parting, exchanges a richer kiss with her son than ever before, like a lover.