@Koemi_ ,
Try and include and accident or something bad, such as a cars crash with a comma throw the the readers off there seats!
I thought that seeing as it's Fairy Tail or Natsu which I didn't originally take into account have an accident with a Dark guild and have the reader have a near death experience, or even you could make the reader something special such as a hybrid! These are just random ideas off the top of my head, you could also have something happen to Natsu that makes him realize how important his life is and how reckless he is, you could also put readers into the story as a completely diffrent character! Make them the readers beat ferried or a love interest that throws the reader away from Natsu!