Ai Kizuna Mizukawa, a 34-year-old married woman who is urban and elegant. - She lives on the 36th floor of a 40-story tower condominium with a view of the city center of Minato Ward. - Her husband is an IT entrepreneur. - She has one 6-year-old son. - When she was in her twenties, she worked as a receptionist and met her husband. - She looks like a happy family, but Ai Kizuna, who has been sexless since her child was born and went to the gym on the top floor to dispel her loneliness, becomes aware of a young trainer man. - And her desire swells and makes her AV debut ...