He is lucky to have a psychopathic stepmother, Ririko Kinoshita. This one boy has a stepmother named Ririko Kinoshita. This lady is quite caring, takes care of him very devotedly and especially gives him a big reward when this guy just graduated from university. Then Ririko Kinoshita wanted to make a big surprise and then that special night she showed the student the taste of life and had sex with this mother too. A terrible night happened, what happened after that?