How THE ABSOLUTE FUCK do you beat that first fucking fight?!
Ok, I'm guessing you did what I did and didn't follow the tutorial. What happens if you go off script is that the game forces you to use cheer on the boss mob, which then does 999 dmg to your knight and kills him.
To avoid this just start the tutorial again and follow the exact instructions(just don't click any skill until it tells you to). That way you taunt first, use heal next, loot, then Cheer on the 3 mobs and get some dialogue. The boss mob appears, reduces your knight to 1 HP, you use Cheer again and finish the tutorial.