Twilight of the Cockroaches

Naomi is drawn to Hans because he represents the outside world and excitement beyond her planned life with Ichiro. Though she and Ichiro are engaged, she harbors doubts about the marriage, partly due to Ichiro's inability to fly, a limitation that makes her question their future together. When Hans arrives injured, Naomi is intrigued by his mysterious background and the possibilities he represents, leading her to secretly follow him to Momoko's apartment despite her existing commitment.

Naomi's doubts about marrying Ichiro are planted early when she contemplates whether their union is truly what she wants.

The Hosino War ended when the original human Hosino clan left the apartment and Mr. Saito moved in. Sage/Professor claims to have negotiated a peace treaty with Saito, but the truth later emerges that Sage never actually met Saito, he simply inferred peace after hiding in the cellar during the entire conflict. The roaches have celebrated Armistice Day ever since, though the peace was built on a fabrication.

The timeline notes that Sage 'had hidden in the cellar during the war and had never actually met Saito,' planting doubt about his authority.

Sage is found dead pinned to a dartboard the day after he promises to discuss Momoko's attack with Saito. While the film doesn't explicitly show who killed him, the implication is that Saito or Momoko eliminated him, likely because Sage was the roaches' leader and figurehead, and eliminating him would demoralize the colony during the upcoming extermination. His death marks a turning point where the humans shift from tolerance to open warfare.

Sage's promise to 'discuss the attack with Saito' directly precedes his murder, suggesting his diplomatic efforts threatened the humans' plans.

Two elderly roaches reveal to Ichiro that Sage fabricated the entire narrative about negotiating peace. Sage had hidden in the cellar during the Hosino War and never met Saito, he simply inferred that peace existed when Saito arrived and didn't immediately kill the roaches. In reality, Saito tolerated the roaches because he was heartbroken over a lost love and didn't care enough to exterminate them. The peace was never a treaty but rather human indifference that Sage transformed into a propaganda story.

The elders emphasize they 'had hidden during the war and never met Saito,' confirming Sage's story was built on assumptions.

Momoko attacks the wedding as part of her ongoing war against the roach tribes. She views the Hosino tribe as enemies and sees the wedding as an opportunity to strike at a gathered cluster of her adversaries. The attack kills many roaches and represents Momoko's refusal to accept any peace with the roach colonies, she wants them eradicated, not accommodated. This escalates the conflict from territorial disputes to outright genocide.

Earlier scenes establish Momoko's hostility toward roaches, as she tries to stomp on Naomi when they first meet.

Hans's militaristic tribe arrives intending to invade and conquer the Hosino colony. However, when they discover the Hosino have almost no food left due to the humans' tightening control, they face a choice: fight a starving enemy or help them survive. The tribes decide to form an alliance against the common human threat, both Ichiro and Hans putting aside their rivalry over Naomi to unite against Saito and Momoko's extermination campaign.

Earlier timeline notes state the alliance forms 'after weighing their own survival,' showing pragmatism drives the decision.

Naomi survives because she possesses a natural immunity to insecticides, which she inherits from her grandmother who appeared to her in a vision before the final battle. This immunity is a genetic trait that allows her to withstand lethal doses of bug spray and poison. She passes this immunity to her offspring, which becomes central to the film's hopeful epilogue showing the next generation of roaches surviving where others could not.

Naomi's grandmother visits her in a vision specifically to tell her she is immune, foreshadowing her survival.

Ichiro is gravely wounded during the final battle against the humans but survives the insecticide onslaught alongside Naomi. Though the film shows him injured and near death during the chaos, the epilogue confirms he lives long enough to escape with Naomi to the yard shrine. The epilogue shows their children together, though some offspring bear resemblance to Hans as well, implying both roaches may have contributed to the litter.

The timeline notes Ichiro is 'gravely wounded' but survives alongside Naomi before the epilogue.

Saito decides to exterminate the roaches after Momoko enters his life and influences him. Their relationship develops across the apartment complex, and Momoko, who already wages war against roaches in her own apartment, encourages Saito to eliminate the colony. The tipping point comes after Momoko's attack on the wedding and Sage's death, when Saito and Momoko together pursue total extermination using bug bombs and sprays, transforming from tolerance to genocide.

Timeline events show Saito and Momoko 'push to wipe out the roaches' after the wedding massacre and Sage's murder.

Naomi's grandfather suggests her litter is likely a mix of both Ichiro's and Hans's children, and the epilogue supports this, some offspring resemble Ichiro while others look like Hans. This biological uncertainty reflects the love triangle that defined the film's emotional core, with the next generation representing the merged legacy of both potential fathers.

The grandfather's line that 'it is likely a mix of both' directly sets up the visual confirmation in the epilogue.

The epilogue shows Naomi with a vast litter of insecticide-immune children, symbolizing hope and adaptation. The roaches have endured near-total genocide but survived through genetic immunity and resilience. The film's ending suggests a future where roaches can live beyond human control, having learned to survive without relying on human indifference. The imagery of the shrine-like toy in the yard represents a new, safer homeland away from apartment dangers.

Naomi's vision of 'a future free from humans' directly foreshadows the epilogue's setting outside the apartment.