After everything that had happened, Irene had successfully integrated into the Fairy Tail guild. Natsu and the others also knew that Irene was the new teacher, specializing in teaching Dragon Slayer Magic, though that was not particularly useful to Natsu.
Because he had already applied for the graduation exam.
Gajeel, Gray, and Lyon had also applied for this graduation exam. Rogue and Sting wanted to apply as well, but based on their rankings in the previous ranking competition, Allen decisively rejected their applications and only approved the applications of Natsu and the other three.
Allen scheduled the exam for this Friday.
With three days remaining before the exam, there was enough time for Irene and Erza to recover.
Irene was quite interested in the Dragon Slayer Mages at the school. Because of the Sage Dragon, she had met several Dragon Kings, including Igneel, four hundred years ago. Even Irene had not expected to still sense Igneel's aura within Natsu's body four hundred years later.
Irene had sensed the presence of the Dragon Kings within these Dragon Slayer Mages the moment she first saw them. As she interacted with them more, Irene now understood why the Dragon Kings had hidden themselves inside their bodies.
It turned out that the Dragon Kings had replaced the Dragon Seeds that cultivated Dragon Slayer Magic. This way, Natsu and the others would not lose their humanity because of Dragonification. At the same time, through Allen, the three parties met while Natsu and the others were asleep.
Allen had always been quite interested in Igneel, but Igneel had not wanted to reveal himself and communicate with him. Now that he had seen Irene, Igneel finally relented and appeared with the other Dragon Kings.
This meeting included the guild's S-Class Mages and Anna, the three giants of