Black clover:The Black Swordsman

This is my first fanfiction.I started it to learn English and waste time I wanted to try writing my own fanfiction so I decided to start this one and i apologize if my grammar is bad i hope you enjoy it the story is about a teenager who was hospitalized all his life due to a heart disease. and after he died he met an old man who granted him wishes and reincarnated him in the world of black clover. i dont own black clover or any thing in the book