After a traffic accident on a mountain road, En, who had nightmares about losing her parents and younger brother, has an ominous premonition. A family trip was coming up in a few days, and they were planning a summer resort in the mountains. She persuaded her father, Kosuke , to stop traveling, but Kosuke did not listen. Meanwhile, a resident of the same apartment tells her that the traffic accident she dreamed of has already happened.