Tatsuya was separated from his mother at a young age and lived with his father. He grew up without knowing his mother's love, but the memory of his mother's kindness and beauty was still alive, and that was his only support in his daily life. Then, time passed and he received a letter. It was from his mother, saying that she wanted to see him for the first time in 12 years. Tatsuya happily headed to the designated hot spring inn, but he had not yet realized that his admiration for his mother had turned into romantic feelings.