Tatsuya was separated from his mother at a young age and had lived with his father ever since. Growing up with almost no knowledge of her, he still carried deep within his heart the cherished memory of his kind and beautiful mother, which had become his emotional anchor. One day, after twelve years of silence, he received a letter from her expressing her desire to see him again. Deeply moved by her words, Tatsuya headed to the hot spring inn she had specified. Yet he remained unaware of one thing—his feelings for his mother were about to transform into something romantic.