The father's serious illness was the reason why his younger brother announced and called his sister Takeuchi home to take care of him carefully before it was too late. Although she knows that her sister is married and the relationship between them is a biological sister, both born by her parents, the frequent appearance of sex addiction along with uncontrollable desires has caused this relationship to be broken. That night, when the lust appeared, the younger brother came to her sister and crushed her and raped her while she kept resisting, but she still refused to let go because the craving had reached its peak and could not be stopped. The sister was unlucky to have a miserable perverted brother.