Thirteen is too young to gain eight years of memories that might come to pass--especially when you don't even know what to do with yourself in the present. But when the future is that bloody and dark, do you have any choice but to try to change it? He remembers the absolute agony of the doctors trying to save him, which finally sent him into blissful unconsciousness— —except he doesn’t remember any of that. Tsuna’s last memory is of putting his head down on his desk and falling asleep to the sound of the teacher’s droning, thirteen years old and tired of not understanding a word, not of being twenty-two and beloved and dying.

Yamamoto has some trouble adjusting to life after they get back from the future. Weirdly enough, Hibari helps.

It was only supposed to be a game. A fun way to pass the time. Maybe even make friends. How was Tsuna supposed to know Jumanji had a mind of its own, or that 'survival game' was very literal?