Luffy Becoming an Apprentice?! A Man Who Fought Against the King of the Pirates!

Ace, Sabo, and Luffy chase down a Danpa and succeeds to catch it, but a tiger steals it. To get revenge, the three brothers put fish on their back to lure the tiger, but a bear that can match the tiger appears. Ace attacks the bear, but it gets angry and chases the three brothers. It is then stopped by a former pirate captain named Naguri using Haki.