Following the untimely passing of his father, Sasaki Shin'ya and his mother moved to a countryside town called Hinoyama, where they now run a café together.
Apart from his job, he has become withdrawn and no longer has any passion. What he seeks is a peaceful and uneventful day-to-day life.
Under the dark winter sky, on a day like any other—multiple people were found dead inside an initially assumed single victim, in a park he passes by everyday.
On the same day, by the twist of an inevitable fate, he met a woman he never should have.
That same night, he died.
Then he woke up—40 years later.