I will keep you safe
One night, the guild has a party. Natsu and Gray had a drinking competition. Without knowing, those two did it.
Two weeks later, Natsu kept getting sick but no one knew why. Erza told him to go and see a doctor then. Once he did, Natsu came back quits the guild, disappearing for 9 months. Then, they found him one night but he then disappeared once again for 5 years, until one day, something happened. Read more to find out.