Supreme Law System

MC got transmigrated into the body of an 18 year old orphan boy Ryan, after dying by a hit & run. He now has a 15 year old little sister Ami, whom the original Ryan protected ‘till he also died by a hit & run when returning home.
He got the Supreme Rule System as soon as he woke up in Ryan’s body.
Soon the once peaceful world turned chaotic. He now has one goal, that is to survive with his sister and rule the now chaotic world.