Ch. 21Ace's First Battle - Luffy Arrives
Roy and Ace defeated Bakedun and rescued the civilians, giving Ace his first real battle and strengthening his resolve. Back at Marineford, Garp brought Luffy to live with Ace, and Roy arranged for Bellemere and the two girls she cared for to join them, turning his residence into a shelter for children.
- Roy and Ace attacked Bakedun's pirate ship, fought together, and knocked Bakedun unconscious while the Marines rescued the civilians.
- Roy returned to Marineford with Ace, where Garp introduced Luffy as Ace's little brother.
- Garp asked Roy to hide Luffy at his residence, and Roy suggested transferring Bellemere to Headquarters to care for the children.
- Luffy and Ace settled into Roy's residence, where they played, trained, fought, and gradually bonded as brothers.
- Sengoku confronted Garp and Roy after Bellemere and the two girls arrived at Marineford, while Tsuru and Zephyr defended the arrangement.