Nao moves into a new home with her husband. Since her husband is busy, she ends up helping her father-in-law, Toru, with the unpacking. He used to be a sailor, and her husband once mentioned that he was disciplined with ropes in the past. Nao has always regarded Toru like her own father. One day, she accidentally breaks a precious plate given to her by Toru. Feeling deeply responsible, Nao pleads with him to tie her up and punish her. Under Toru's expert rope work, Nao begins to experience pleasures unlike anything she's ever known...