College sweethearts Riku and Minami marry. He becomes a novelist while her singing dreams fade. After a fight, she vanishes. Suddenly, he's just an editor, and a singer named Minami Maezono exists-but he's never met her.

Akemi Yoshikawa discovers that her whole office is stuck in a time loop, repeating the same stressful work week over and over. Together with her colleagues she has to find out how to break the loop.