A rich man and his adopted sisters with no relatives. This man was an unmatched pervert with a mask of a good man. The man who became her adoptive father bullied her sister at every opportunity. In contrast, her younger sister was loved with her lewd heart fully open. Her younger sister who decided to become a maid and serve in order to protect her older sister. Using his feelings for such a sister, the giant adoptive father leans on her sister Yui! Yui, who continued to be fucked until her delicate body broke, gradually lost her reason.
