The "-Final-" subtitle indicates this is the last entry in the My Gravure Idol Wife series. The first game ended with Haruki suspecting but not knowing. The second game introduced a false "revenge" ending that was later revealed to be a daydream.
Players manage stats that track the wife's loyalty versus her "corruption." These stats directly influence which of the multiple endings are triggered. NTR - My Gravure Idol Wife -Final- -O-MAn-GAMEs-