Total sales have exceeded 27,000 units! The popular group Team☆Lucky's hit work "Put in a secret he doesn't know about" has been made into a live-action film! A young student couple is approached by a dull old man on their way home from school. Before they started dating, Yui (Yui) met him on a dating app out of sexual curiosity, and to whom she gave her virginity... He threatens her with sex photos, and Yui into a physical relationship again. Yui reluctantly agrees to sex out of fear that he will find out, but she gradually becomes addicted to the pleasure and begins to crave the old man's dick... The definitive NTR work is here, in which a beautiful girlfriend becomes addicted to the dull old man's dick (warning: disgusting)!