"Don't show mercy to them. They are not 'another you' or your relatives and friends, but intruders."
Before leaving, Reborn's words still vaguely lingered in his ears, but with the person in front of him who had the same face as himself, Tsuna was a little hesitant.
Through the news delivered by Bai Lan, there are many parallel worlds where many people who have traveled through time have poured in. The fate of 'Sawada Tsunayoshi' who disturbed those worlds was completely off the normal track.
Parallel worlds are not unrelated. If this 'travel wave' is allowed to develop like this, sooner or later even the world he lives in will be affected - and even he himself will be replaced by an unknown alien soul.
Being 'traveled' is just a matter of time. In order to change the status quo, as the only one who defeated Bai Lan in all parallel worlds, he must shoulder this responsibility.
All he has to do is 'defeat' all the invaders.