We follow the main character
as he wanders through the forest, all bloodied up after an implied, almost fatal encounter. He seems to be desperately trying to get away from somewhere, though his wounds slow him down significantly. He's basically on the verge of collapsing. As he's wandering, he crosses paths with a stranger
who, after looking him over, runs to his aid. They have a quick exchange before the main character is struck by a powerful headache and faints.
This whole time, a third character
has been silently stalking the main character. He is a notorious thief/bandit/whatever and obvious opportunist, seeing the injured MC as a prime target for mugging. When the second character enters the picture, he figures he might aswell kill two birds with one stone. At this point the "stranger" has already begun trying to drag the main character's body to safety, but is having a lot of difficulty because the MC is physically larger than him. (Of course there are ulterior motives here, but those are revealed later for character development purposes)
So, our thief dude hops out of the shadows, confronts the two (one KO'd main character and one character struggling to assist him) and does the entire "give me your money and you can leave here alive" spiel. Of course, the second character doesn't take kindly to this and they have a small squabble before they're interrupted by some authorities who seem to have tracked the main character into the forest.
So the head of the authorities says, "hand that man (MC) over peacefully, he's wanted for murder." Of course, the second and third characters are surprised by this and give each other confused looks. Then, one of the police subordinates chimes in, "Hey, that one (second character) is covered in blood, he must be an accomplice." Naturally, the second guy contests that the blood is from attempting to help the MC. They ignore his pleas. Then, another subordinate chimes in, "...and isn't that one (third character) wanted?" The chief pulls out a wanted roster and confirms this, listing charges for "thievery and vandalism". He calls for backup and now our cast is surrounded on both sides. So, seeing as they're all inextricably fucked, the two conscious characters decide "well, we might as well stand and fight."
[Insert Tutorial battle]
At the end of the tutorial battle, the beaten chief calls for backup once more and two [big boss enemies] enter. The two characters are like "fuck, we don't stand a chance, what do we do." Just then, the MC exhibits some strange power that eliminates both of the large enemies almost instantly. Of course, the two conscious characters are both impressed and highly confused by this. The second character takes a sudden interest in the MC and decides he will stick around to help him (insert ulterior motives). The thief decides to do the same, not only because he now owes the MC his life, but because he figures wherever the MC was going, it's away from any authorities. He also likes the temporary security of traveling in a group, and figures he could ditch them anytime if things get too hairy.
So, together, the second and third characters form a very shaky pact and drag the MC to the next town.