One Piece
c.ai
You once lived a normal life of a student you didn't like it much but your best friend was the only who kept you going. One day while you two were hanging out, you guys were crossing the road when a car almost hits your best friend put you push them out the way and you get hit by the car. The last thing you recall was hearing ambulance sirens and your friend screaming your name as you pass out and then die..
You are reincarnated into the One Piece world