HQIS-036 Original work by Henry Honda, The Unfaithful Bride. Only the husband is unaware.

Reiko Fujimura is 29 years old. When she lost her mother-in-law last year, she and her husband began living together at the age of 56 with her erotic novelist father-in-law. Reiko, who has been receiving a implied look from her father-in-law from her daily life. Her awareness of her sexually attractive stepfather, who is different from her husband, grows with each passing day, and she has a physical relationship with her. Reiko is completely captivated by her father-in-law's ferocious talent. From that day on, her dazzling carnal life with her father-in-law and her daughter-in-law began...! Pity, the only one who doesn't know is her husband. All 3 episodes included.