≪ fleshy collaboration again! Another live-action adaptation of the blockbuster NTR doujin comic based on Shin ≫ Maru! Keita and Saki, who have grown up together since childhood, call each other "Kei-chan" and "Saki-chan" and aspire to the same swimming competition. They are aware of each other as the opposite sex and have a secret relationship as a man and a woman. Saki, who knew that Keita was going to confess to herself if she became a member of the swimming club, consulted with Miwa, who was her senior, but she was taken advantage of and lost her virginity to Miwa.