While her sister is in the hospital in the final month of pregnancy, Rio is asked to look after her brother-in-law Ken. However, she happens to come across him having an affair... "You don't care if it's a hole! How disgusting!!" She yells at him in anger, and Ken, unable to resist, rapes her to keep her quiet. Humiliated by her scum brother-in-law, Rio continues to resist, but she can't stand his caressing her private parts again and again, and cries out "I can't take it anymore! Stop!!"