Masaaki was the one who gave birth to Ryo when she was 20 years old. - His father evaporated, and Ryo raised Masaaki single-handedly, despite the opposition of those around him. - The relationship between father and son was good, and the two were more like friends than father and son. - One day, Masaaki invites Ryo to a hot spring trip. - Despite Ryo having fun on their usual trip together, Masaaki was thinking of confessing his feelings to Ryo.