The episode begins with a montage that reflects on the events leading up to the Marineford War, showcasing the bonds between the Straw Hat Pirates and their allies. The narrative focuses on the significance of brotherhood and the promises made among the characters.

The scene shifts to Luffy, who is determined to rescue his brother, Portgas D. Ace, from execution. Luffy's emotional turmoil is palpable as he recalls his childhood memories with Ace and Sabo, emphasizing their deep bond. The flashbacks illustrate their shared dreams and the vow they made to protect each other, highlighting the theme of brotherhood that runs throughout the episode.

Next, the episode transitions to the various members of the Straw Hat crew, each reflecting on their own motivations and the reasons they fight. Zoro recalls his promise to Luffy to become the world's greatest swordsman, while Nami remembers her desire to map the entire world. Each character's internal struggle and determination are depicted through their expressions and dialogue, reinforcing their commitment to their captain and each other.

As the montage continues, we see scenes of the crew's past adventures, including their battles against formidable foes and the friendships they forged along the way. The emotional weight of these memories is underscored by the music, which swells as the characters confront their fears and resolve to support Luffy in his quest to save Ace.

The episode then shifts focus to the Marines and the preparations for the impending war at Marineford. Admiral Akainu and other high-ranking officers discuss their strategies, revealing their ruthless determination to eliminate the Whitebeard Pirates and capture Ace. The tension builds as the Marines prepare for the confrontation, showcasing their confidence and the stakes involved.

In a pivotal moment, the narrative returns to Luffy, who is shown training and gathering strength for the battle ahead. His resolve is unwavering as he recalls the sacrifices made by his friends and the importance of their bonds. This determination is mirrored in the expressions of his crew, who are shown rallying around him, ready to face whatever challenges lie ahead.

The episode culminates in a powerful scene where Luffy, surrounded by his allies, declares his intention to save Ace at all costs. The emotional weight of his vow resonates with the audience, encapsulating the essence of brotherhood and the lengths to which they will go for one another. The screen fades to black, leaving viewers with a sense of anticipation for the battles to come at Marineford.

In the ending of One Piece, season 13, episode 457, titled "A Special Retrospective Before Marineford! The Vow of the Brotherhood!", the episode concludes with a montage of significant moments from the series, focusing on the bonds of friendship and the determination of the Straw Hat Pirates. The episode emphasizes the vow of loyalty and brotherhood among the characters, particularly Luffy's commitment to save his brother, Portgas D. Ace, from execution. The emotional weight of their shared experiences and the sacrifices they are willing to make for one another is highlighted, setting the stage for the impending conflict at Marineford.

As the episode unfolds, it begins with a somber tone, reflecting on the gravity of the situation surrounding Ace's impending execution. The scene transitions to Luffy, who is resolute in his mission to rescue his brother. His determination is palpable, and the audience can feel the weight of his emotions as he recalls the moments he shared with Ace, from their childhood to their time spent together as brothers.

The narrative then shifts to a series of flashbacks, showcasing the bonds formed between Luffy and his crew, as well as the friendships he has made along his journey. Each flashback serves to reinforce the theme of brotherhood, illustrating how these relationships have shaped Luffy into the person he is today. The visuals are rich, with vibrant colors and dynamic action sequences that capture the essence of each character's journey.

As the episode progresses, we see Luffy's crew, the Straw Hat Pirates, rallying around him, each member expressing their unwavering support for Luffy's mission. The camaraderie among the crew is evident, with moments of laughter and determination that highlight their shared goals and dreams. The emotional stakes are raised as they prepare to face the challenges ahead, knowing that the battle at Marineford will test their resolve and strength.

The episode culminates in a powerful montage that intersperses scenes of Luffy's past with his present resolve. The imagery of Luffy's iconic straw hat serves as a symbol of his dreams and the bonds he cherishes. The final moments are filled with a sense of urgency and anticipation, as the characters prepare to confront the Marines and the powerful figures at Marineford.

In the closing scenes, the episode leaves viewers with a sense of hope and determination, emphasizing the importance of friendship and the lengths one will go to protect loved ones. The fate of Luffy, Ace, and the Straw Hat Pirates hangs in the balance, setting the stage for the epic confrontation that lies ahead. The bonds of brotherhood are reaffirmed, and the audience is left eager to see how these relationships will be tested in the battles to come.

In the episode titled "A Special Retrospective Before Marineford! The Vow of the Brotherhood!" from One Piece, there is no post-credit scene. The episode primarily serves as a retrospective, revisiting key moments and themes from the series leading up to the Marineford War. It focuses on the bonds of friendship and the motivations of the characters, particularly Luffy and his determination to save his brother, Portgas D. Ace. The episode emphasizes the emotional stakes and the deep connections between the Straw Hat Pirates and their allies, setting the stage for the intense events to come in the Marineford arc.

The episode delves deeply into the relationship between Luffy and Ace, highlighting their childhood memories and the promise they made to each other. It captures the emotional weight of their bond, showcasing Luffy's unwavering resolve to save Ace from execution, which serves as a driving force for his actions in the upcoming Marineford arc.

In episode 457, significant past events are revisited, particularly focusing on Luffy's encounters with his crew members and allies. The episode showcases Luffy's determination and the bonds he has formed, emphasizing moments such as his meeting with Zoro, Nami, and others, which solidify their brotherhood and shared dreams.

The Straw Hat Pirates are central to the retrospective, as the episode revisits key moments that define their camaraderie and individual motivations. Each member's backstory is briefly touched upon, illustrating how their past experiences and dreams intertwine with Luffy's quest, reinforcing the theme of friendship and loyalty.

The emotional stakes are heightened as the episode builds tension leading to the Marineford War. It showcases Luffy's desperation and determination to rescue Ace, interspersed with flashbacks that reveal the sacrifices and struggles of various characters, setting a somber yet hopeful tone as they prepare for the impending conflict.

The episode includes flashbacks of key characters such as Whitebeard, Shanks, and the Marines, providing insight into their motivations and perspectives regarding the war. These flashbacks reveal their connections to Luffy and Ace, illustrating the broader implications of the conflict and how it affects the world of One Piece.

The episode "A Special Retrospective Before Marineford! The Vow of the Brotherhood!" from One Piece contains several elements that may be considered objectionable or upsetting for children or sensitive viewers. Here are some aspects to consider:

1. Violence and Battles: The series often features intense battles and violence, which may be graphic or emotionally charged, even if not explicitly gory.

2. Death and Sacrifice: Themes of death, sacrifice, and the emotional weight of losing loved ones are prevalent, which can be heavy for younger audiences.

3. Emotional Turmoil: Characters experience significant emotional distress, including feelings of despair, betrayal, and loss, which may be upsetting for sensitive viewers.

4. Imprisonment and Torture: The setting of Impel Down involves themes of imprisonment and the harsh treatment of prisoners, which can be disturbing.

5. Dark Themes: The overarching themes of war, loyalty, and the struggles against oppressive forces may be complex and intense for younger viewers to fully grasp.

While the show is generally aimed at a younger audience, these elements may require parental guidance for children or may be distressing for sensitive individuals.