Maiko lost her husband at an early age and raised her young child Kousuke by herself.But as her son became more like the husband she loved, her body writhed with secret desires, and she continued to emanate alone.Kousuke also had love for her mother that was more than family, and spent his time hiding his feelings from each other.And then, on the night before her Kousuke's wedding, she said, "Only for tonight, the first and last time...", with her affectionate gestures.However, the lust that has been hidden for many years drives the two of them to further pleasure.