Namikawa Kenta (Ino Kei), who works at a commercial production company, and Natsume (Ihara Rikka) are a happy couple that everyone envies. However, Natsume is dissatisfied with Kenta's excessive doting. Kenta, who has no way of knowing what is going on in his wife's mind, one day sees a message from a person named "Yamacchi" that arrived on Natsume's smartphone. It says that the two of them have made a promise to meet at a hotel, and Kenta is shocked that Natsume may be having an affair.The next day, Kenta decides to find out the truth from Natsume, but just as he is about to do so, Natsume is killed in a traffic accident as she leaves the house. That night, Kenta is left alone and stunned by the sudden turn of events. He sheds tears in his room, but the moment the clock strikes 11:22, Natsume, who was supposed to be dead, appears before him. Moreover, Natsume says that it was Kenta who died in the accident...

At the same time every day, Kanta (Ino Kei) is able to mix with Natsume's (Ihara Rikka) world and spend a few minutes with her. He calls this phenomenon "mixing". Meanwhile, there are only three days until Natsume meets Yamatchi at a hotel. Who will it be? Meanwhile, Natsume, who lives in a world without Kanta, behaves bravely, as if she doesn't need the concern of those around her. However, when she is cleaning up Kanta's desk, she finds a bunch of notes addressed to Kanta from Natsume... Unable to contain her memories, Natsume stops by a game bar on her way home from work and gets drunk. That night, Kanta, who has mixed with Natsume's world, is surprised to see Natsume sleeping drunk in a messy room. Moreover, he finds men's underwear and a note saying, "I'll put the key in the mailbox" in the laundry..

On Saturday night, Natsume (Ihara Rikka) made an appointment to meet Yamatchi at a hotel, but when she didn't come home by the time of the mixer, Kanta (Ino Kei) grew impatient. Meanwhile, while enjoying her mother Kaede's (Minamino Yoko) home cooking at her parents' house, Natsume realized that she had been ignoring the discomfort she felt towards Kanta in her married life, and she began to worry about the future of their marriage. Then, Maruyama (Nomura Kota), worried about Natsume, could no longer suppress his feelings of love and went out of control. Meanwhile, Kanta was about to question Maruyama about his relationship with Natsume. Then, Riko (Saito Nagisa) came over and Kanta was caught up in something Maruyama said, and he asked how long they had known each other... Meanwhile, Natsume's uncle and detective Minoru (Nozoe Yoshihiro), who was investigating Kanta's accidental death, found something that brought him closer to the truth of the death..