Mio lives happily with her husband. But a major turning point soon strikes her life. The man who once tormented her best friend and got her pregnant—the source of a deep, dark grudge—suddenly moves in as a guest: her husband's younger brother. The couple has struggled to conceive, avoiding discussion of their infertility, but once the brother-in-law learns their secret, he forcefully pressures Mio. Eventually, she is tied up and overpowered. Compared to her husband's ED, Mio gradually becomes drawn to her brother-in-law's insatiable, rock-hard cock. Watch as Mio's heart wavers and her forbidden relationship with her brother-in-law unfolds in an intense, can't-look-away drama.