Senku and the Kingdom of Science continue their preparations for the looming confrontation with Dr. Xeno's forces. The episode opens with the group working to transform their ship into an aircraft carrier, a defensive measure against the anticipated attack from Xeno and his lieutenant, Stanley. The atmosphere is tense but focused, as each member of the team contributes to the construction, aware that their survival depends on out-innovating their technologically advanced adversaries.

Meanwhile, Gen remains inside Xeno's fortress, maintaining his cover as a double agent. He learns that Stanley is on his way to assassinate the leader of the Kingdom of Science. Gen's earlier lie--that "Dr. Taiju" is the mastermind--has backfired, as Stanley now plans to eliminate Taiju with a sniper attack, a threat that even Taiju's physical prowess cannot counter. Gen is visibly anxious, realizing the gravity of the situation and the limitations of his deception.

Back at the Kingdom of Science's base, the group is introduced to Luna, a new character from Xeno's camp. Luna is portrayed as both alluring and comically inept as a spy. She is accompanied by two men vying for her attention, but her instincts lead her to correctly identify Senku as the true leader, despite Gen's earlier misdirection. Luna's presence provides comic relief, but also highlights the cultural differences between Xeno's militaristic society and Senku's science-driven community. She is visibly shocked by the quality of life in the Kingdom of Science, especially when she experiences vanilla ice cream, a luxury unknown in Xeno's camp.

Senku, ever the pragmatist, seizes the opportunity to showcase the benefits of science to Luna, hoping to win her over or at least sow doubt in Xeno's ranks. He explains the process of making vanilla ice cream, emphasizing that science is not just about survival but about improving daily life. Luna, though initially skeptical, is visibly moved by the experience, her demeanor shifting from aloof to genuinely curious.

As the episode progresses, the tension escalates. Stanley, armed and determined, sets out on his mission to assassinate Taiju. The Kingdom of Science, unaware of the immediate threat, continues their preparations. Senku, however, remains vigilant, constantly assessing their defenses and considering Xeno's next move. The group's mood is a mix of determination and underlying anxiety, as they know that a single misstep could be fatal.

Gen, still inside the fortress, attempts to gather more information and possibly delay Stanley's departure. He engages in subtle manipulation, trying to buy time for Senku's group, but is acutely aware of the danger Stanley poses. Gen's internal conflict is palpable--he is torn between maintaining his cover and protecting his friends, his usual confidence tinged with unease.

The episode's climax arrives with a major revelation: Dr. Xeno is revealed to be Senku's old mentor. Through a flashback, it is shown that a young Senku once reached out to NASA for help with his rocket experiments. While most scientists ignored him, a 20-year-old Xeno responded with detailed instructions and encouragement, enabling Senku to pursue his scientific dreams. However, the flashback also reveals Xeno's growing bitterness as his own projects were repeatedly rejected by NASA. When presented with a hypothetical "stone world" scenario by Senku's father, Byakuya, Xeno coldly states he would rule with an iron fist, eliminating any opposition. This revelation casts Xeno's current actions in a new light, showing that his conflict with Senku is not just ideological but deeply personal.

The episode ends on a cliffhanger, with the characters poised for the next phase of their confrontation. Stanley is en route to carry out his assassination, Gen is struggling to maintain his cover, and Senku's group remains unaware of the imminent danger. The revelation of Xeno's past connection to Senku adds emotional weight to the impending conflict, as both sides prepare for a battle that is as much about science and survival as it is about unresolved mentorship and betrayal.

Luna is a young woman sent by Stanley, an ally of Dr. Xeno, to infiltrate the Kingdom of Science and locate Taiju so that Stanley can assassinate him. In Episode 6, Luna successfully finds Taiju but is charmed by Senku, who uses the opportunity to extract information about Xeno's plans. Luna's presence adds humor and mystery to the episode and is central to the espionage subplot.

In Episode 6, Senku realizes and reveals that Dr. Xeno is actually his old science mentor from childhood and a former NASA scientist. This revelation intensifies the conflict between Senku's Kingdom of Science and Xeno's empire, adding a personal dimension to their rivalry and raising the stakes of their battle.

The episode focuses on strategic moves and plotting rather than direct combat, showing Senku and his team transforming their ship into an aircraft carrier to defend against Xeno and Snider. Meanwhile, Gen is undercover in Xeno's fortress, learning about assassination plans targeting Taiju. The episode builds suspense through conversations, espionage, and scientific innovation, setting the stage for the upcoming climax.

Senku and Francois create vanilla ice cream for Luna as a gesture to gain her trust and extract information. This act of scientific creativity not only adds humor and charm to the episode but also demonstrates Senku's ability to use science in unconventional ways to achieve strategic goals during the conflict.

Episode 6 balances tension and suspense with humor and endearing character moments. The overacting and exaggerated disbelief of characters provide comic relief, making the heroes more relatable. The episode also explores trust and suspicion, especially with Ryusui's suspicion of Luna and Senku's secret plans. The personal history between Senku and Xeno adds emotional depth to their rivalry.