This is the third installment of Nanao Riona's memorial work, celebrating her 9th anniversary since her debut! The theme this time is to keep cumming for 120 minutes of non-stop masturbation! Of course, it's not just about masturbation, but a group of dicks will also appear to interfere with the challenge! They will launch various erotic attacks on Minami! Will Nanao Riona Minami, who is a self-proclaimed natural masturbator, be able to reach the finish line of her masturbation marathon safely?