Shiho, a modest novelist, finds herself unexpectedly married to a dedicated security officer who proposed after only four dates. While she is happy, doubts arise when her husband's former flame, the elite and beautiful Nakamura Toko, appears and suggests that the marriage was merely a matter of convenience and age. Despite the tension and Toko's cruel remarks, Shiho's husband reaffirms his deep devotion, proving that his love for her is genuine and enduring.