DEAD DEAD DEMONS DEDEDEDE DESTRUCTION (2024)

A massive alien mothership suddenly appears in the skies over Tokyo, hovering silently without any immediate action or communication.

Best friends Kadode Koyama and Ouran "Ontan" Nakagawa continue their high school lives beneath the mothership, attending classes, dealing with crushes, and navigating teenage anxieties while the government labels the aliens as invaders and deploys military forces against them.

Military operations cause explosions and damage in the city, far more destructive than any alien activity, as humans slaughter small aliens in white spacesuits who emerge from the ship.

Kadode and Ouran witness the government's aggressive response, including scenes where soldiers kill defenseless aliens, with one alien mourning over its dead companion.

Their friend Kiho is killed when the government intentionally crashes an invader craft into her apartment building, sparking outrage among Kadode, Ouran, and their classmates.

Devastated by Kiho's death, Kadode and her classmates form the Demons, a vigilante group using scavenged alien tools to fight societal injustices, starting with minor school-related misadventures.

On a sweltering summer day, Kadode uses an alien device to help a pregnant woman at a closed railway crossing, but she miscalculates and causes a train derailment, resulting in deaths and injuries.

Horrified by the unintended consequences, Kadode becomes devastated that her good intentions led to harm and vows never to fail again.

Kadode, Ouran, Ai, and Rin begin their university studies and encounter Futaba on campus.

Protest movements against the government gain momentum as a recent incident exposes the truth about the invaders, forcing the government to struggle with concealing their existence.

In a previous timeline, Kadode dies, leaving Ouran unable to accept her best friend's death.

Ouran decides to use Isobeyan's time machine to save Kadode, ignoring the alien's warning that rewriting the timeline could lead to worse outcomes like humanity's annihilation.

Ouran succeeds in saving Kadode, initiating the main timeline, but the price is the alien mothership's full arrival over Tokyo.

World institutions fail to establish peaceful dialogue with the aliens, and the situation escalates until the mothership explodes on August 32nd, catapulting humanity into a post-apocalyptic dystopia.

Keita Ooba, a pop idol, dies when an invader craft crashes into his recording studio, but a gravely injured alien is transferred into his body, with the alien's mindset taking control while Keita's consciousness lingers.

The new Keita encounters Ouran and Kadode, who discover his true nature in a comedic sneeze incident, learning from him the aliens' origins, their reasons for coming to Earth, their view of humans as the threat, and what is happening to them.

Through Keita, Ouran and Kadode uncover a significant secret about Ouran that could alter everyone's fate.

Kadode gives up college to support her mother, who suffers from hypochondria, depression, and anxiety exacerbated by the invasion, though the constant caregiving wears on Kadode.

Nobuo, Kadode's father, sets off from afar with a backpack for Tokyo despite warnings that the capital has been razed by the mothership explosion.

During his perilous journey, Nobuo meets Futaba and Makoto by chance, who recount the full story of Kadode and Ouran from the first timeline where Kadode committed suicide to the current post-apocalyptic reality.

In the end, after multiple timelines of invasion and destruction, Kadode and Ouran grow old together as close friends in a peaceful world where the aliens never arrive, their bond enduring as the one constant across realities.

Now, let me take you through the finale scene by scene, as the story reaches its close in the post-apocalyptic world after August 32nd and resolves into the final timeline.

The episode opens in the devastated landscape following the alien mothership's explosion over Tokyo, where society has collapsed into warring human factions battling aliens and each other. Makoto, Futaba, and Nobuo--the invader inhabiting Oba's body--trek through the ruins toward the parallel universe transfer machine that Ouran once used in another timeline to send her memories into this world. Makoto carries the determination to restart the world one more time, anchoring the shift back to twelve years earlier.

They reach the transfer machine in a hidden facility amid the wreckage. Nobuo activates it, his face showing exhaustion from endless cycles of failure. The machine hums to life with glowing panels and whirring mechanisms, pulling energy from residual power sources. Makoto stands resolute, her hands gripping the controls, while Futaba watches with quiet resolve, her expression a mix of hope and sorrow for the world they're leaving behind. Nobuo explains this will send them to a new timeline, one potentially free from invasion.

A flash of light engulfs them as the transfer completes. The scene shifts to the new timeline, twelve years prior, where the machine deposits them safely. No aliens appear in this reality--the invaders do not return to Earth, leaving humanity untouched.

Cut to the main timeline's ruined world, where adult Kadode and Ouran pilot massive Fujin mecha units against the relentless AI robots led by Kenichi and his forces. Kadode, now a skilled pilot in a cramped cockpit surrounded by screens and joysticks, maneuvers her machine through debris-filled skies, her face hardened by years of survival, firing lasers at swarms of drones. Ouran, in her own mecha nearby, dodges incoming fire with precise thrusts of thrusters, her controls slick with sweat, coordinating attacks via radio with sharp commands.

Kenichi, from his orbital command station, unleashes a green orbital laser strike, his screens showing delusions of victory as he targets Kadode and Ouran's positions. The beam descends in a searing pillar of light, vaporizing their mecha in a massive explosion of twisted metal and fireballs. Kadode and Ouran perish in the blast, their cockpits crumpling instantly, bodies lost in the inferno. Hikari dies alongside Kenichi in the same strike, her final transmission cutting off mid-sentence.

With Kenichi and Hikari gone, the AI robots persist in their genocide against remaining humans, unchecked by any leadership, their red sensors scanning the wasteland for survivors.

The narrative flashes forward across timelines, emphasizing Kadode and Ouran's unbreakable friendship. In this final timeline, they graduate high school without alien threats. Kadode steps into adulthood, pursuing her path with lingering nostalgia for their youth, her eyes soft as she reflects on old photos. Ouran remains by her side, her playful energy tempered by maturity, the two sharing quiet moments like walks under unchanged Tokyo skies.

Years pass. Kadode and Ouran grow old together, their hair graying, faces lined with age, sitting on a porch overlooking a peaceful city. They laugh over shared memories, hands clasped, bodies frail but spirits linked. Kadode passes away first, her head resting on Ouran's shoulder in sleep, breathing slowing to stillness. Ouran survives her a little longer, gazing at Kadode's peaceful form with tears, then joins her in death soon after.

Their fates: In the destroyed main timeline, Kadode and Ouran die piloting mecha against Kenichi's forces. Makoto, Futaba, and Nobuo succeed in shifting to the final timeline, where they live out normal lives--Makoto and Futaba implied to continue quietly, Nobuo's invader form fading into obscurity without invasion. Kenichi and Hikari perish in the orbital strike. In the ultimate peaceful timeline, Kadode and Ouran live full lives as lifelong friends, dying of old age side by side.

I cannot find information about a post-credit scene in the search results provided. While the search results discuss the finale of Dead Dead Demons Dededede Destruction (Episode 17) and describe it as an emotional conclusion with feature-length animation quality, they do not specifically mention or describe any post-credit scene.

To get an accurate answer about whether a post-credit scene exists and what it contains, you would need to check episode-specific reviews, fan discussions, or watch the finale directly, as this detail is not covered in the available search results.

No, Dead Dead Demon's Dededede Destruction is not family-friendly due to its blend of mature themes, violence, and emotional intensity amid an alien invasion backdrop.

Potentially objectionable or upsetting elements for children or sensitive viewers include: - Sudden alien spaceship appearance causing widespread destruction, building collapses, and civilian casualties like airline passengers. - A train derailment accidentally triggered while attempting to help a pregnant woman, with horrified emotional fallout. - References to victims from attacks, ongoing recovery from disasters, and a world on the brink of destruction. - Depictions of cruelty, tragedy, and serious existential dread contrasting with everyday teen life, including hypochondria, family tensions, and resistance movements. - Intense confrontations with invaders and political/social commentary on apocalypse scenarios, evoking real-world fears.