Five years after marrying my childhood friend Kanon, my father-in-law passed away, and I ended up living with my mother-in-law, Taeko. My admiration for Taeko, who was also my first love, had been buried deep in my heart, but as we started living together, I felt my feelings for her resurfacing. One day, Taeko asked me for advice about an offer to become an underwear model. Of course, my wife was strongly against it, but Taeko, who couldn't give up, took advantage of my wife's absence the next day and begged me to take pictures of her in her lingerie...