On a night when his wife is away on business, Mizuki and her father are left alone together. Mizuki, lost in thoughts of her father, begins masturbating in the quiet room. Her father accidentally witnesses her and is overwhelmed by conflicting emotions. Wearing thigh-high socks, Mizuki removes her underwear and starts seducing him. The girl who once said, "I'm going to marry Daddy," whispers the same words again. Unable to resist her advances, her father is gradually drawn into the forbidden zone.