Because of Dreams

The flashback returns to roughly nine years prior, when the feared Cook Pirates under their chef captain Zeff storm a liner freshly returned from the Grand Line. Zeff orders his men to seize anything of worth, and on catching one of his own crew pilfering food from a sack, he kicks the thief across the deck while insisting that no one ever helps himself to another's meal. The young Sanji refuses to give in, attacking the raiders with his kitchen knives. Beaten yet unbowed, he declares he cannot die before finding the All Blue. The other pirates roar with laughter at the notion, though Zeff regards the boy with a thoughtful look.

As the storm worsens, an enormous swell sweeps Sanji into the sea. Going against his own better sense, Zeff snaps off a mast with a kick, takes hold of it, and dives after the boy just as a larger wave tears both ships to pieces. Days afterward Sanji wakes on a lifeless rock with only Zeff beside him, the surrounding wreckage proving no one else made it. With rescue improbable, Zeff parcels out their scavenged food and posts Sanji on the far shore so they can scan more of the horizon. Alone at dusk, ravenous, the boy forces himself to ration like a proper cook. On the opposite side, Zeff clenches a wedge of wood in his teeth, lifts a boulder overhead, and drives it down to cut off his own leg below the knee, ending the days of "Red Leg" Zeff.

Zeff's Jolly Roger appears for the first time. The chapter delivers the earliest glimpse into Sanji's history and the beginnings of his bond with Zeff. The two end up marooned on an island, where Zeff dares Sanji to make his rations last and then amputates a leg of his own to spare what little food remains.

Trivia from the wiki marks this as the only chapter so far that omits Luffy entirely. The cover continues Buggy's Crew Adventure Chronicles, in which Mohji and Cabaji duel for the right to inherit the captaincy while their crewmates look on, their mourning over.