The episode begins with a flashback to Kozuki Oden's past, showcasing his legendary swordsmanship and the techniques he developed during his time training with the Whitebeard Pirates and later with Gol D. Roger. The scene highlights Oden's determination and the bond he formed with his crew, emphasizing his desire to protect Wano and his family. The flashback transitions to the present, where the remnants of Oden's legacy are felt deeply by his retainers, particularly Kin'emon and the other samurai.

In the present, the battle at Onigashima intensifies as the alliance of the Straw Hat Pirates and the samurai confront the Beast Pirates. Kin'emon, alongside his comrades, is determined to honor Oden's memory and utilize his secret swordplay techniques. The scene shifts to the battlefield, where the samurai are engaged in fierce combat against the formidable forces of Kaido and Big Mom. The atmosphere is charged with tension as the stakes of the battle become increasingly dire.

Kin'emon, fueled by his memories of Oden, decides to demonstrate the "Oden's Secret Swordplay" technique. He gathers his allies and prepares to unleash the inherited technique, which he believes can turn the tide of the battle. The samurai rally around him, their spirits lifted by the thought of Oden's strength and the hope of victory. Kin'emon's internal struggle is palpable as he grapples with the weight of his responsibility to his fallen lord and the future of Wano.

As Kin'emon begins to execute the technique, the scene is filled with dynamic visuals of swordplay, showcasing the elegance and power of Oden's style. The animation captures the fluidity of the movements, with Kin'emon channeling Oden's spirit as he strikes down enemies with precision. The other samurai join in, each using their own skills to complement Kin'emon's technique, creating a beautiful display of teamwork and camaraderie.

The battle reaches a critical moment when Kaido and Big Mom take notice of the samurai's newfound strength. Kaido, enraged by the audacity of the samurai to invoke Oden's name, retaliates with overwhelming force. The scene shifts to a fierce confrontation between Kaido and the samurai, where Kin'emon and his allies must defend themselves against Kaido's devastating attacks. The tension escalates as the samurai struggle to maintain their footing against the powerful Yonko.

In a pivotal moment, Kin'emon manages to land a significant blow on Kaido, showcasing the effectiveness of Oden's technique. The impact reverberates through the battlefield, surprising both allies and enemies alike. However, Kaido quickly recovers, his fury igniting as he prepares to unleash a counterattack. The samurai's morale is tested as they witness the sheer power of their opponent, but they remain resolute, driven by their loyalty to Oden and their desire to protect Wano.

The episode culminates in a climactic showdown, with Kin'emon and the other samurai standing firm against Kaido's onslaught. The visuals depict the chaos of battle, with explosions and clashes of swords filling the screen. Kin'emon's determination shines through as he recalls Oden's teachings, pushing himself to the limit in order to honor his master. The emotional weight of the moment is palpable, as the samurai fight not just for their lives, but for the legacy of Kozuki Oden and the future of their homeland.

As the episode draws to a close, the battle rages on, leaving viewers on the edge of their seats, eager to see how the confrontation will unfold and whether the samurai can truly harness Oden's secret swordplay to achieve victory against the overwhelming forces of Kaido and Big Mom.

In the ending of "One Piece" Season 21, Episode 1004, titled "An Inherited Technique! Unleashing Oden's Secret Swordplay!", the episode culminates in a dramatic confrontation where Kozuki Momonosuke and his allies face off against the formidable forces of Kaido and Orochi. The episode highlights the emotional weight of Oden's legacy as Zoro and the others utilize Oden's secret swordplay techniques, showcasing their growth and determination to liberate Wano. The episode concludes with a sense of hope and resolve as the characters prepare for the battles ahead, embodying the spirit of rebellion against tyranny.

As the episode unfolds, we begin with a flashback to the past, where Kozuki Oden's legacy is deeply felt. The scene transitions to the present, where the tension in the air is palpable. The Straw Hat Pirates, alongside their allies, are gathered, their expressions a mix of determination and anxiety. They are aware that the fate of Wano hangs in the balance, and the weight of Oden's teachings rests heavily on their shoulders.

Zoro stands at the forefront, his mind racing with memories of Oden's swordplay. He recalls the lessons learned from the legendary samurai, feeling a surge of responsibility to honor Oden's memory. As he grips his sword, the resolve in his eyes reflects his commitment to protect his friends and the people of Wano. The atmosphere is charged with anticipation as Zoro prepares to unleash Oden's secret techniques.

The scene shifts to the battlefield, where Kaido and Orochi's forces are gathered, their menacing presence a stark contrast to the hopeful spirits of the rebels. The clash of swords and the roar of battle fill the air as Zoro and his allies charge forward. Each strike is infused with the essence of Oden's teachings, showcasing the fluidity and power of the inherited techniques. The choreography of the fight is dynamic, with Zoro executing Oden's moves with precision, his body moving in harmony with the rhythm of battle.

As the fight intensifies, we see glimpses of other key characters, such as Kin'emon and the other samurai, who are also inspired by Oden's legacy. Their faces are etched with determination, each of them channeling their grief and hope into their combat. The emotional stakes are high, as they fight not just for their lives, but for the future of Wano and the memory of their fallen leader.

In a pivotal moment, Zoro faces off against one of Kaido's top commanders. The tension escalates as Zoro recalls Oden's words, igniting a fierce determination within him. He unleashes a powerful attack, a culmination of Oden's swordplay, which resonates with the spirit of the samurai. The impact of the blow sends shockwaves through the battlefield, symbolizing the strength of their resolve and the unbreakable bond forged through shared struggles.

As the episode nears its conclusion, the camera pans over the battlefield, capturing the chaos and the bravery of the fighters. The rebels, fueled by Oden's legacy, push forward with renewed vigor. The scene is filled with a sense of camaraderie and hope, as they fight not just for themselves, but for the generations to come.

The episode ends on a cliffhanger, with the fate of the characters still uncertain. However, the resolve in their hearts is clear. They are ready to face whatever challenges lie ahead, united by the teachings of Kozuki Oden and the dream of a liberated Wano. The final shot lingers on Zoro, his expression fierce and determined, embodying the spirit of a warrior ready to carry on Oden's legacy into the next battle.

In episode 1004 of One Piece, titled "An Inherited Technique! Unleashing Oden's Secret Swordplay!", there is no post-credit scene. The episode concludes without any additional content after the credits roll. The focus remains on the intense battles and emotional moments that unfold during the episode, particularly highlighting the significance of Oden's swordplay and its impact on the characters involved. The narrative centers around the legacy of Kozuki Oden and how his techniques are being passed down, emphasizing themes of inheritance, courage, and the fight for freedom in Wano.

Oden's secret swordplay is a pivotal element in this episode, showcasing the legacy of Kozuki Oden and the impact of his techniques on the current battle. The episode reveals how Oden's unique fighting style, particularly the 'Oden Two Sword Style,' is inherited by his followers, emphasizing the importance of passing down skills and knowledge through generations.

Zoro's reaction to learning Oden's techniques is one of determination and respect. He recognizes the power and significance of Oden's swordplay, which fuels his desire to master it. Zoro's internal motivation is driven by his ambition to become stronger and honor the legacy of those who came before him, particularly Oden.

In this episode, Kin'emon plays a crucial role as he reflects on his past with Oden and shares the importance of Oden's techniques with the other characters. His emotional connection to Oden's legacy adds depth to the narrative, as he encourages the others to embrace Oden's teachings and fight with the same spirit.

The episode vividly depicts the emotional weight of Oden's legacy through flashbacks and character interactions. Characters like Kin'emon and Zoro express their feelings of loss, pride, and determination as they recall Oden's bravery and sacrifice. This emotional resonance drives them to honor Oden's memory by fighting fiercely in the present.

The visual elements used to illustrate the swordplay techniques in this episode are dynamic and fluid, showcasing intricate sword movements and powerful strikes. The animation highlights the speed and precision of Oden's techniques, with vibrant colors and dramatic angles that enhance the intensity of the battles. The choreography of the swordplay is designed to evoke a sense of awe and respect for Oden's skills.

In "One Piece" Season 21, Episode 1004, titled "An Inherited Technique! Unleashing Oden's Secret Swordplay!", there are several elements that may be considered objectionable or upsetting for children or sensitive viewers:

1. Violence: The episode features intense battles with swordplay and combat, which may include graphic depictions of injuries and fighting.

2. Death and Loss: Themes of loss and the impact of death on characters are present, as the backstory of Kozuki Oden involves significant tragedy that may be emotionally heavy.

3. Emotional Struggles: Characters experience deep emotional turmoil, including feelings of betrayal, grief, and determination, which may resonate strongly with viewers.

4. Dark Themes: The overarching narrative includes themes of oppression, suffering, and revenge, which can be intense and may not be suitable for younger audiences.

5. Mature Concepts: The episode touches on complex themes such as loyalty, sacrifice, and the weight of legacy, which may require a level of maturity to fully understand.

These elements contribute to the overall tone of the episode, which may be more suitable for older children and adults.