In Sakurada, a small town near the Pacific Ocean, nearly half the population possesses some form of unique power. These abilities range from entering a cat's mind to resetting the world to a specific point in the past. A group called the "Kanrikyoku" controls and monitors the use of these powers. Kei Asai and Haruki Misora work for their school's "Houshi" club, which carries out missions assigned by the Kanrikyoku. Misora has the ability to reset the world by three days. This means that all events and memories of the past three days that "could have" happened are erased as if they never occurred. Kei has the ability to "remember" the past. Even after Misora uses her power to reset the world back three days, Kei retains those three days in his memory. By combining their powers, the two solve missions issued by the Kanrikyoku.