This drama is adapted from the novel of the same name. It tells the story of Mao Koshiba, an inconspicuous office lady, who learns that her boyfriend, who is in a relationship with her in the company, is having an affair. The next morning, she gave up on herself and drank heavily. When she woke up, she found herself lying on the bed of a handsome guy she didn't know. The handsome guy Sou Ando appeared as a new boss in the workplace and told a shocking fact. "You are no longer Mao Koshiba, but Mao Ando." Mao got married because she was drunk. For some reason, Sou began to dote on Mao, whom he just met. Mika, a professional woman who targeted that scar, betrayed Mika's emotionally violent boyfriend Kota, disrupting Mao's life, which should have been ordinary. The truth hidden in the secret doting "0-day marriage" will be revealed one by one...