Natsu has died 3 times in his life but was brought back to life by his Elder Brother. Natsu loves Zeref as his own Father. Natsu hasn't seen Zeref in 11 years when he had to leave and Natsu has been waiting patiently for him to come. Zeref Dragneel, Brother of Natsu and Husband of Mavis, save his brother 3 times. Zere...
After the defeat of Zeref and the fall of the Alverez empire, Natsu only option left is, as it seems, death. Through the power of what can only be described as a miracle, Natsu is transported into Assiah but not as his own person, no that would be too easy, but as the demonic familiar of the upcoming exorcist Rin Okum...