A Cruel Wonderful World

(I'm still learning English, so you've been warned.) I was the most powerful martial artist in the world. No one could beat me, or even make me fall in the midst of the battle. I was strong. At the young age of 21, I reached the pinnacle of martial art brutality. And when I reached the age of 23, I've been diagnosed because of the sudden sickness, which was rare to my body. And led to my lonely death. Death was fine for me. The only thing I regret, I died a virgin, talking about being lonely. Maybe next time, if there's a second life, I should try to become normal. (I don't own Demon Slayer) Author here! just saying.