Episode 4 of the second season of Kaiju No. 8 , which aired on Saturday, August 9, 2025, delivered one of the series' most impactful moments. The plot revealed that Kaiju No. 9's true target was not Kafka Hibino , but rather Chief Isao Shinomiya and the powerful Number 2 Weapon .
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The true mission of No. 9

After Kafka defeats one of No. 9's variants, headquarters celebrates the apparent victory. However, Narumi suspects the enemy had a bigger plan. Her suspicions are confirmed when central detects another Kaiju signal. No. 9's main body emerges from an analyst inside the base, and Isao realizes its objective is to steal the Number 2 combat equipment .
Confrontation at the central command

While ordering the evacuation, Isao faces the enemy alone. Even using all of Number 2's strength, he realizes that No. 9 has evolved beyond the Defense Force's predictions. Determined to eliminate the threat to protect his daughter, Kikoru, Isao surpasses his own limits and unleashes devastating attacks that even expose the Kaiju's core.
However, No. 9 resists, regenerates quickly, and counterattacks. With his human body stretched to its limit, Isao becomes vulnerable. The villain takes advantage of this to consume him and merge with Number 2, declaring: "Become a Kaiju again."
The merger and the new enemy

Narumi and Kafka arrive and, for a brief moment, believe Isao survived. However, Kafka realizes the truth: No. 9 now controls the boss's body. With amplified power, the Kaiju blocks both of their attacks simultaneously.
Kikoru tries to intervene, but the enemy taunts her by showing part of her father's face. Narumi reminds him that Isao had already planned to retire after forming the strongest unit and entrusted its leadership to him.
The episode ends with No. 9 about to escape, suffering post-merge rejection, but still strong enough to capture Narumi and confront Kafka at the same time, leaving a cliffhanger for the next chapter.
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