The female student Koko lost her mother a year ago and lived with her father. However, her father left her at home with his mistress Ikumi to go on a business trip alone. One day, Koko was betrayed by the boy she liked and broke down in tears. To fill the heart of the sad girl… The measure Ikumi took to heal Koko's wounds was… bondage SM training! S and M between women... Pleasure and sadness intertwine in this chaotic bondage lesbian world!