After five years of marriage, Misaki and her husband remain on good terms, yet their relationship has drifted into a sexless routine. Despite Misaki’s shy attempts to reignite their passion, her busy husband remains oblivious to her needs. The dynamic shifts when her husband's younger brother comes to her to consult about quitting his job. Sensing her loneliness and frustration, the brother-in-law exploits the situation, drawing Misaki into a forbidden affair fueled by the very desire her husband ignores. This seventh volume explores Misaki’s psychological collapse as she surrenders to a carnal lust that shatters her five-year marriage.