Fairy Tail: the First Dragon God Slayer

The beginning

  Zaru and his sister,misaki,were walking in darkness.there was a sudden flash of light. When zaru woke up,he found himself lying in a grassland.
  He looked around to find misaki and found her being carried away by a bandit.He sprinted towards him trying to save his sister when the bandit used earth magic to throw him to the ground.
  He got shocked for a second and got up and felt a slight shock going through his veins.A figure appeared in front of him telling him to try imagining the bandit getting absorbed by flames.He was reluctant at first but when the figure told him that it would not harm his sister,he imagined the bandit getting consumed by flames.He did not even notice a magic circle forming on both his hands as he saw the bandit burn to ashes.
  He ran towards his sister and caught her just in time.She woke up and blasted zaru with a fireball out of shock.When she noticed it was him,she ran over and checked if he was ok."So u can use it to huh."He said as he took off his burnt shirt.
  "Sorry..."misaki said as she helped him up.He ruffles her hair and walks towards the figure.He asks"Who are u?"
  "The only being that can help u unlock your full potential in your type of magic."it replies.
  "Magic?Whats magic?"he asks.
  "Magic is what you used when u burnt that Man into ashes"it replies.
  "You what!?"shouted misaki when she heard what he had done.
  "He was kidnapping you and i didn't know what to do so i listened to this guy-thing no offence and burnt him to ashes."
  She punched his head and told him never to do that again.He walked towards the mysterious figure and demanded to know who or what it was.
  It took off its hood and said "my name is kurama"after saying that,it tuened into a dragon god in the form of a human and turned into a massive sized man with dragon scales and massive wings that spewed out lava,his eyes glowing red and yellow,and his fingers with claws that looked like they would be able to cut the planet in half in one blow.
  Zaru looked at him as he started to shrink down till he was as tall as Zaru.
  "I can teach u how to manifest your power if u follow me to heaven to start your training."
  "What about misaki?"he asks.
  "She will have to find a way to live by herself. "Kurama says.

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Credits to MiyukiRina for helping me out with the plot.