“Maybe I should wash your back for you once in a while.” Ruisa Totsuki is stunned when her usually intellectual and gentlemanly father-in-law makes the unexpected offer. Insisting that they are family despite having no blood relation, he corners the young wife at the edge of the tub before she can object. The instant his gently advancing fingers touch her wet skin, her peaceful married life collapses. What begins as the worst tragedy of her life while her husband is away eventually transforms, through overwhelming orgasms, into a forbidden routine...