The episode begins with a focus on Luffy, who is still reeling from the emotional weight of his brother Ace's death. He is in the midst of a battle in Dressrosa, where he encounters a mysterious figure named Sabo. Luffy is astonished to see Sabo, who he believed was dead, standing before him. The moment is charged with emotion as Luffy's eyes widen in disbelief, and he struggles to process the reality of Sabo's presence.

As Luffy and Sabo embrace, the scene shifts to a flashback that reveals Sabo's backstory. It shows his childhood with Luffy and Ace, highlighting their bond and the promise they made to each other. Sabo explains how he survived the incident that was thought to have taken his life, detailing his journey and the hardships he faced. This backstory deepens the emotional connection between the characters and emphasizes the significance of their brotherhood.

Returning to the present, Luffy is overwhelmed with joy and relief at Sabo's return. Sabo reveals that he has inherited Ace's will and the Mera Mera no Mi, the Flame-Flame Fruit, which Ace once possessed. This revelation stirs a mix of emotions in Luffy, who feels both happiness for Sabo and a sense of loss for Ace. The weight of Ace's legacy hangs heavily in the air as Sabo expresses his determination to carry on Ace's spirit.

The scene transitions to the ongoing conflict in Dressrosa, where the Straw Hat Pirates are engaged in a fierce battle against Doflamingo's forces. Luffy and Sabo discuss their plans to take down Doflamingo, with Sabo expressing his desire to fight alongside Luffy. The camaraderie between the two brothers is palpable, and they share a moment of understanding about their shared goals and the importance of their fight for freedom.

As the battle intensifies, the focus shifts to the various members of the Straw Hat crew, who are facing their own challenges against Doflamingo's subordinates. The episode showcases the chaos of the battlefield, with characters like Zoro, Robin, and Franky fighting valiantly. Each member of the crew is determined to protect their friends and achieve victory, highlighting their unwavering loyalty to one another.

In a pivotal moment, Luffy and Sabo decide to join forces, combining their strengths to confront Doflamingo. The two brothers prepare for an epic showdown, their resolve solidified by their shared history and the memory of Ace. The atmosphere is charged with anticipation as they strategize their approach, ready to face the formidable enemy together.

The episode culminates in a dramatic confrontation between Luffy, Sabo, and Doflamingo. The tension builds as they engage in a fierce battle, showcasing their unique abilities and fighting styles. Luffy's determination to avenge Ace and protect his friends fuels his attacks, while Sabo demonstrates his mastery of the Mera Mera no Mi, unleashing powerful flames against their adversary.

As the fight progresses, Doflamingo retaliates with his own devastating techniques, creating a chaotic and dangerous environment. The stakes are high, and the outcome of the battle hangs in the balance. Luffy and Sabo's teamwork is put to the test as they navigate Doflamingo's relentless onslaught, each blow resonating with the weight of their shared past and the legacy of Ace.

The episode concludes with a cliffhanger, leaving viewers on the edge of their seats as the battle rages on. Luffy and Sabo's determination to honor Ace's memory and their commitment to each other set the stage for the next phase of their fight against Doflamingo, promising more intense action and emotional moments to come.

In the ending of One Piece, Season 16, Episode 663, Luffy is deeply moved when he meets Sabo, who reveals that he has inherited Ace's will. The episode concludes with Luffy and Sabo sharing a heartfelt moment, reminiscing about their past and the bond they shared with Ace. The emotional weight of their reunion emphasizes the themes of brotherhood and legacy, as Luffy grapples with the loss of Ace while finding solace in Sabo's presence.

As the episode unfolds, it begins with Luffy standing on the battlefield, still reeling from the intense fight against Doflamingo and the chaos that has enveloped Dressrosa. The atmosphere is charged with tension, and Luffy's expression reflects a mix of exhaustion and determination. He is surrounded by the remnants of the battle, the cries of the citizens echoing in the background as they begin to recover from the turmoil.

Suddenly, Sabo appears, emerging from the shadows with a confident stride. Luffy's eyes widen in disbelief and joy as he recognizes his long-lost brother. The moment is electric, filled with a sense of reunion that transcends the chaos around them. Luffy's heart races, and he feels a surge of emotions--relief, happiness, and a hint of sorrow for Ace, their deceased brother.

Sabo, with a warm smile, reveals that he has taken up the mantle of carrying Ace's will. He explains how he has been living in Ace's memory, fighting for the ideals they shared. Luffy listens intently, his heart swelling with pride and nostalgia. The bond between the three brothers--Luffy, Ace, and Sabo--becomes palpable as they reminisce about their childhood dreams and the promises they made to each other.

As they talk, the scene shifts to flashbacks of their time together, showcasing their adventures and the deep connection they forged. Luffy's laughter echoes in the air, mingling with the bittersweet memories of Ace's sacrifice. The emotional weight of their shared history hangs heavily, and Luffy's eyes glisten with unshed tears as he grapples with the reality of Ace's death.

In a poignant moment, Sabo reveals that he has inherited Ace's Mera Mera no Mi, the Flame-Flame Fruit, which Ace once possessed. This revelation strikes Luffy profoundly, as he realizes that Sabo will carry on Ace's legacy in a way that honors their brother's spirit. The weight of this inheritance is not lost on Luffy, who feels a mix of pride and sorrow, understanding the significance of Sabo's words.

The episode culminates in a powerful scene where Luffy and Sabo embrace, a gesture filled with unspoken understanding and love. The world around them fades away as they share this moment, symbolizing the strength of their brotherhood and the enduring bond that connects them despite the trials they have faced. Luffy's heart swells with hope as he sees Sabo not just as a brother but as a continuation of Ace's spirit.

As the episode draws to a close, the camera pans out, capturing the aftermath of the battle in Dressrosa. The citizens begin to rebuild their lives, inspired by the courage of Luffy and his friends. Luffy, Sabo, and the Straw Hat crew stand together, united in their resolve to honor Ace's memory and continue their journey. The episode ends on a note of hope and determination, emphasizing the themes of legacy, brotherhood, and the unbreakable bonds that tie them together.

In episode 663 of One Piece, titled "Luffy Astonished! The Man Who Inherits Ace's Will!", there is indeed a post-credit scene.

After the main episode concludes, the scene shifts to a serene beach setting where a group of children is playing. They are joyfully building sandcastles and laughing, embodying the carefree spirit of youth. Among them, a young boy stands out, holding a straw hat that resembles the one worn by Monkey D. Luffy.

As the camera focuses on the boy, he gazes out at the ocean, a look of determination in his eyes. He expresses his desire to become a great pirate, just like Luffy and his brother, Portgas D. Ace. This moment is filled with a sense of hope and inspiration, reflecting the legacy of Ace and the impact he had on those around him. The scene captures the essence of dreams and aspirations that are central to the One Piece narrative, leaving viewers with a sense of continuity and the passing of wills from one generation to the next.

The post-credit scene serves as a poignant reminder of Ace's influence and the enduring spirit of adventure that drives the characters in the series.

Sabo's appearance in episode 663 is pivotal as it reveals that he has survived and is now a high-ranking member of the Revolutionary Army. His reunion with Luffy is emotionally charged, as Luffy is astonished to see his long-lost brother, who he believed was dead. This moment highlights the bond between the brothers and the weight of Ace's legacy, as Sabo expresses his desire to carry on Ace's will.

Luffy's reaction is one of shock and overwhelming emotion. He is initially speechless, grappling with the reality that Sabo is alive and has taken on the responsibility of fulfilling Ace's dreams. This moment is filled with a mix of joy and sorrow, as Luffy reflects on Ace's death and the impact it had on him. Luffy's internal struggle showcases his deep love for his brothers and the pain of loss.

The Mera Mera no Mi, the Flame-Flame Fruit, is central to the plot as it symbolizes Ace's legacy. Sabo reveals that he has inherited the fruit, which grants him the powers that Ace once possessed. This revelation not only signifies Sabo's connection to Ace but also sets the stage for future conflicts, as the fruit is highly sought after. The emotional weight of this inheritance is felt deeply by Luffy, who sees it as a way for Sabo to honor Ace.

The relationship between Luffy and Sabo is depicted with deep emotional resonance. Their reunion is filled with nostalgia and a sense of brotherhood, as they reminisce about their childhood and the bonds they formed. Luffy's astonishment at Sabo's survival and his acceptance of Sabo's new role in the world reflects the strong familial ties that define their characters. The episode captures their joy and the bittersweet nature of their reunion, emphasizing the theme of brotherhood.

Sabo's new role in the Revolutionary Army has significant implications for the overarching narrative of One Piece. It positions him as a key player in the struggle against the World Government, aligning him with other major characters like Monkey D. Dragon. This development not only expands the political landscape of the series but also sets up potential future confrontations and alliances, particularly as Luffy continues his journey. Sabo's involvement adds depth to the conflict and raises the stakes for Luffy and his crew.

The episode "Luffy Astonished! The Man Who Inherits Ace's Will!" from One Piece contains several elements that may be considered objectionable or upsetting for children or sensitive viewers. Here are some aspects to be aware of:

1. Themes of Loss and Grief: The episode touches on the emotional weight of losing loved ones, particularly focusing on the legacy of Portgas D. Ace. This may evoke feelings of sadness or discomfort.

2. Violence: While One Piece is known for its action, there are scenes of combat and conflict that may be intense for younger viewers. The battles can be visually striking and may include injuries.

3. Emotional Turmoil: Characters experience strong emotions, including anger, despair, and determination, which may be intense for some viewers.

4. Mature Themes: The episode explores themes of inheritance, legacy, and the burdens of expectations, which may be complex for younger audiences to fully grasp.

5. Character Struggles: Some characters face significant personal challenges and moral dilemmas, which could be distressing for sensitive viewers.

Overall, while the series is generally aimed at a younger audience, these elements may require parental guidance for younger children or those who are particularly sensitive to emotional or violent content.