I'm Counting On You! A Letter From a Brother!

Sabo's ship is destroyed by a Celestial Dragon. Ace and Dadan return to the bandits house to the relief of Luffy and of the other bandits. Dogra returns from town and informs them about Sabo's death. Later Ace receives a letter from Sabo, that was written before he set out to sea. The letter told Ace to take care of Luffy.