If this turns into a temporal cold war it will gets really boring really fast.
My guess because the first prince from the future gave nano machine to the mc, either one or more than one people came back and started to teach the demon sword and sword G** techniques to the people, because the other people from the future wants mc dead (he would have been if he didn't get the nano machine) they are using his enemies from mc's timeline to kill him.
If I am right I will drop this, immediately.
My guess because the first prince from the future gave nano machine to the mc, either one or more than one people came back and started to teach the demon sword and sword G** techniques to the people, because the other people from the future wants mc dead (he would have been if he didn't get the nano machine) they are using his enemies from mc's timeline to kill him.
If I am right I will drop this, immediately.