After Ace was hit by Akainu during the Paramount War, he remained conscious. As Shanks left with Whitebeard and Ace's body, Ace's body was suddenly swept into the time-space turbulence by the power of a Time-Time Fruit Devil Fruit User. Out of guilt, the Devil Fruit User slowed the time affecting Ace's body until it was practically frozen, but could only keep it that way for seven days. Before then, Ace had to heal his wounds.
The story being watched is Ace's journey after he transmigrates five years into the future.
There are three timelines in the present, so the story has three volumes. They all watch the same events, but since the story is so long, the timelines will be written separately to avoid confusion.
The three timelines are when Luffy has just set sail, after the Paramount War, and after the Onigashima War.
Theme: The Time-Time Fruit cannot change the past, but it can create the future
