Reiko is remarried to Kenichi who has two stepchildren.However, her plump and obscene body of Reiko gives a strong stimulus to her brothers Kenji and Masao who have reached her age.And strangely, Reiko passes Kenichi who works at night shift and falls into sexlessness.Then her brothers start fighting to make her Reiko their own.Masao shows off an innocent erection and presses for sexual treatment, and Kenji who was watching it later asks for a body saying "Do it to me".And the desire of the brothers was to seek Reiko in the distortion.