I Transmigrated Into Another World And Became The Strongest Swordsman!

There are different ways to die in this world. Some die by accidents, Murder or even suicide, but my question is, what is the most painful way to die. Is it being tortured or beating to death? Is it being sentenced to death for something you didn't commit or is it being poisoned by the one's you love? Well whatever it is, I myself had my own share of a painful death and what is more painful than to be killed by the love of your life. I was born weak and died weak but when I finally thought that I could go to the place they all called, 'The afterlife' Instead I woke up in an whole new world and if that isn't the most shocking thing, I Transmigrated Into the body of the strongest and most powerful swordsman who is exactly the complete opposite of me. And this world isn't an easy one as it's literally the brother of hell, what I'm I gonna do when I am tasked by to accompany the locked princess to the Soul keeper who can save her kingdom and it doesn't seem like it's gonna be an easy journey. "Why me!!!"