Arc 4The Fifth Emperor
Natsu drove the Marines from Origin Island and prepared the Uchiha Clan to grow stronger through Haki, while news of his bounty spread across the seas. As the clan’s defenses improved, Natsu prepared to leave, and Ace crossed paths with Luffy while pursuing Teach.
- Natsu fought Kizaru until the Marines’ fleet escaped, then vowed with the Uchiha to avenge their dead and ordered the clan to train in Haki.
- Natsu befriended Ace, gave him a ship, warned him about Teach, and secretly marked him with Flying Thunder God before Ace sailed away to pursue Teach.
- Natsu mourned the four Uchiha who died and directed the clan’s recovery, training, and development of Origin Island.
- Natsu drew the Void Demon Fox and learned that its Sage Mode could strengthen Mangekyō Sharingan users and extend their lifespans.
- Sengoku ordered nearby Marine branches to withdraw and issued bounties for Natsu, Fugaku, and Uchiha fighters, while Morgans publicized Natsu as the Fifth Emperor.
- Whitebeard taught Natsu Haki training methods, and Natsu brought them to Fugaku, who began organizing lessons for the clan’s stronger members.
- Natsu gave Izumi a Flying Thunder God kunai for emergencies, then told Fugaku he would be away for three to five days as Fugaku’s second Hashirama Cells transplant stabilized.
- Ace prepared to pursue Teach in Rainbase, met Luffy and the Straw Hat Pirates, warned Luffy about Crocodile, and gave him a black Den Den Mushi.