Taichi became pregnant when Kaho was 18 years old and gave birth to her despite the opposition of those around her. Her father disappeared when she found out she was pregnant, and Kaho raised Taichi alone. She was on good terms with her mother and daughter who were close in age. One day, Taichi invited Kaho to a hot spring trip during the university summer vacation. Kaho was carefree and thinking about the usual fun trip, but Taichi had a feeling that she wanted to tell Kaho when she became an adult...
