Orgy Party Gets Documented

An evil politician, Arimori Kamoshige, has been the local governor for 40 years. He abuses his power and, as a result, has gained both wealth and women. The protagonist’s father is Arimori’s right-hand man and manager of his slush fund, but ends up expelled from duty after being falsely charged of a crime. He becomes discouraged and calls his runaway son, Tatsuya.