Married for four years with no children yet, they have been cherishing their bond as a couple. One day, Saki attended her alma mater's reunion, and her husband sent her off in high spirits. However, that night, she never came home. She finally returned the next afternoon, but inside her bag was an unfamiliar video camera. On it were recordings of her acting completely out of character—bold and uninhibited. Shocked by the footage, her husband began noticing subtle changes in her behavior from that day forward. As their marital trust starts to crumble, what hidden desires was she truly concealing?