With Madara Uchiha and Shisui Uchiha there, Naruto took over all of Eldia in just a day.
And... by then, the Eldian Core had already changed rulers. Eren's father, Grisha Yeager, had slaughtered almost the entire former Eldian Royal Family.
It probably wouldn't be long before he found Eren and had Eren eat him to gain the powers of both the Founding Titan and the Attack Titan.
Naruto had also searched for Grisha with Observation Haki, but when he failed to find him, he gave up.
Naruto had Shisui stay in the Eldian Core and use Genjutsu to control the members of Eldia's largest religious sect, the Wall Religion.
Then he had the Wall Religion spread the truth about Eldia's secrets.
Meanwhile, Naruto and Madara took some of the core members of the Survey Corps-more accurately, members of the Red Army-back to their previous base.
By the time Naruto returned, Wolffy had already built the Dimensional Shuttle.
And the Shadow Clone Naruto had left behind had caught an unexpected prize: Eren's father, Grisha Yeager.
Over the course of that day, Grisha had tried several times to escape with Eren, but Naruto's Shadow Clone had easily found him and dragged him back every time.
Naruto created another Shadow Clone and left him behind to teach a few core members of the Red Army the Six Powers or Nen.
As for Naruto himself, he went to find Grisha.
Grisha was one of the people who knew the true nature of this world. He wanted to resist the Marleyan Government, yet he was disappointed in Eldia. Knowing he didn't have much time left, he wanted to place all his hopes in his son, Eren.
Little did he know... his thoughts, or rather, everything he had done, had been influenced by the