"I'm sorry for you ... I was waiting for my father-in-law's big cock ..." As soon as the couple were supposed to live happily on a three-legged race, Minami's beloved father fell ill and died suddenly ... A large amount of debt of my father was discovered. Instead of my father-in-law taking over for Minami who is at a loss, he demands a physical relationship. Minami, who cannot refuse, is gradually eroded by her father-in-law's big cock, both physically and mentally.