When Shota, who was separated from his mother at a young age, was in junior high school, his late father remarried Claire, who was 20 years younger than him. They were close, and Shota grew to love her as a woman. Meanwhile, a colleague had asked her out, and Claire was unsure what to do, so she decided to invite Shota to a hot spring and tell him how she felt. When Shota was invited, he also decided to use this opportunity to tell her how he felt.