Suspicion of infidelity suddenly invades the daily life of a married woman. A 28-year-old woman named Shimizu (pseudonym) was entering her fourth year of marriage with her husband, with no children. She had reconnected with her same-age college friend several years after graduation, began dating, and married a year later when he was transferred to Tokyo. After moving to the capital, she had no friends and relied solely on her husband. Yet doubts about their relationship began to surface. Unable to confront him, a year passed. Their marriage stagnated, and having children seemed impossible. Amid this turmoil, the reason a married woman exposes herself to a man other than her husband... Here lies the two-day, one-night record hidden deep within her heart.