Summary:
Big Mom recovers from her fall and approaches Onigashima again, while Kaidou and the members of the Worst Generation continue to fight. Zoro manages to scar Kaidou, but both he and Law are defeated and Luffy decides to defeat the Emperor.
Big Mom falls into the ocean and starts to drown, but her friends can’t save her. Kaidou helps them and Prometheus and Napoleon escape Zoro and Killer. While Zeus is still trapped in the box, Prometheus and Napoleon dive into the sea, rescue Big Mom and take her back to Onigashima.
On the way, Big Mom thanks Prometheus and Napoleon for saving her, but is angry with Zeus for not coming to her aid. Prometheus, no longer willing to share his power with Zeus, suggests that Big Mom leave him and make a new friend to be his girlfriend. She agrees. As they board the island, the Heart Pirates watch her from the Polar Tang, upset that she survived.
Kaidou prepares to finish off the unconscious Luffy, but Zoro uses the last of his strength to shoot him down. He uses a Nine Swords style attack combined with Haoshoku Haki, slashing through Kaidou’s chest and reopening his scar. Kaidou retaliates and defeats both Zoro and Law with Raimei: Hakke. However, Luffy stands up and vows to defeat Kaida.
The anime adds the following:
Prometheus asks Big Mom for a girlfriend.
Short shot of Hera.
Heart Pirates on the Polar Tang expressing their disappointment at Big Mom’s survival.
The anime expands on the following:
Zoro attacking Kaida with Ashura Bakkei: Moja no Tawamure.
The conversation Big Mom and Prometheus have about Zeus’ uselessness, including Big Mom agreeing to create a new special homie to replace Zeus.
Big Mom is seen falling straight into the ocean before being rescued by Prometheus and Napoleon. In the manga, it was not specifically shown that she fell into the ocean.