Kawahara Yukari (played by Masami Nagasawa), an office lady of a large beverage company, and her boyfriend Koide Kippei (played by Issey Takahashi) fell in love at first sight. Their life was originally peaceful, simple and happy, but all this was disrupted by a sudden incident. One day, Kippei suddenly fainted due to subarachnoid hemorrhage, but was later discovered by medical staff that his driver's license and medical license were all forged. Yukari was shocked to learn the news. She felt completely unfamiliar with this boyfriend who she had been with for five years. After that, Yukari invited a private detective to investigate Kippei, and found clues from an unfinished novel manuscript of her boyfriend. Who is he? Why is he willing to let himself and his lover live in lies? The story of this film is based on real events.