An astronomer in a Japanese observatory, peering into his telescope one night, becomes the first person to witness a planet emerging from a wormhole. He names the planet after his daughter, Remina, and both become world-famous thanks to the unprecedented discovery. However, things take a turn for the worse when the planet enters a collision course with Earth... and the stars along the wayseem to be disappearing...A single-volume manga by Junji Ito. Like the rest of his works, it's filled to the brim with plenty of Body Horror, Eldritch Abominations, and general horror.
An Aesop: Surprisingly enough for a Junji Ito story, it ends with a clear and uplifting one. No matter how badly things have gone, no matter how bleak the future seems, so long as you are still alive there is hope for something better.
Apocalypse How: Physical Annihilation of the Solar System, to be exact.
In fact the manga shows just how it gets there. The breakdown of society early on is merely icing on the cake.
Artistic License - Physics: At one point, the earth is spun around so fast that the stars blur in the sky like the hyperspace lines in Star Wars. Aside from everyone not instantly dying from this, there is even a scene where a huge group of people are able to use the centrifugal force to fly through the air all the way around the earth and back, and some of them even survive falling back to the ground.
If the rest of the Earth moves with you, you're not going to die from a little spinning. But if only the earth is spinning, and the air isn't, then...
Asshole Victim: Just about everyone who dies, mostly by virtue of joining the Remina murdermob shortly before their demise. Also, the cabal of corrupt government officials and rich fatcats who try to escape to Planet Remina and, unsurprisingly, meet horrific ends.
Ass in a Lion Skin: Played deadly serious. One of Remina's tongues inserts itself into a discarded spacesuit to lure in the Mineichi family and make them let their guard down so it can devour them. It's likely the humanoid figures from the probe footage were actually a similar trick.
Attempted Rape: Mineichi's son shows Remina the airtight room, claiming she'll be protected in there...and then tries to rape her. When she fights him off, he claims she came on to him, and Remina is thrown back to the mob.
Clothing Damage: By the end of the story, Remina has just enough of her dress left to cover all the important bits.
Contrived Coincidence: Remina meets up with a hobo, who just happens to be the Mineichi's long-lost son, whose family also just happens to have some sort of bomb shelter in their basement which ends up saving Remina, the hobo, and a few others.
Corrupt Corporate Executive: Mineichi. He's happy to sponsor Remina to boost his popularity, but he's just as happy to turn her over to an angry mob once associating with her threatens him.
Cosmic Horror Story: Without doubt. Although the ending ultimately defies the usual message of cosmic horror — human life is indeed important, because with it comes hope, the potential for things to be better.
Crucified Hero Shot: Remina, her father and the hobo are all tied to a cross so they can be sacrificed. The angry mob stabs her father with spears, and then lights them on fire.
Dead Line News: An anchorman is reporting on the situation with planet Remina and the riots all over the world. Just after mentioning that an angry mob is hunting down Remina, he is attacked by two Malevolent Masked Men.
Cultist: We interrupt this broadcast to bring you a message. We represent a concerned group of citizens who love Mother Earth. [...] There remains but one way to save the Earth. Find Professor Oguro and his daughter Remina. Destroy them.
Explosive Decompression: From the inside out, for the poor human survivors who got attacked on Remina by the crewmember they purposely let die. Or they had all their internal organs crushed by the tentacle. Either way, it was painful.
How We Got Here: The manga begins with Remina tied to a cross, surrounded by a huge crowd and a couple of shadowy figures who want to kill her, while two monstrous eyes watch the scene from the sky.
Humans Are Bastards: For the most part, anyway. Panicking at the thought of the coming apocalypse, the populace direct their anger towards Remina and her father, brutally murdering the latter and chasing the former around the earth.
Perhaps somewhat justified in that the angry masses were being egged on by the cultists, but otherwise yes - this trope is played fairly straight.
Bum: They get you, they don't, don't mean a thing to them. They'd never stop with you now that they got a taste for it.
Said Hobo's point becomes even more poignant when it's also pointed out that sooner or later, everyone would turn on each other in the vain hope of sparing their own skin.
Informed Ability: Remina (the person) becomes famous because of her association with Planet Remina. She (reluctantly) uses the fame to become a famous idol. It's never made clear what she does beyond standing on a stage/in front of cameras and looking pretty. It's possible people are paying to see precisely that, making her career An Aesop about the insanity of fandom, or something.
Lecherous Licking: While Planet Remina "licks" the surface of Earth with its tongue, the main cultist does the same to Remina's face, with a tongue that's weirdly similar to the planet's own.
Left Hanging: As is common in both Cosmic Horror Stories and Junji Ito's, whatever the hell was planet Remina is never revealed. Nor is, for that matter, the identity of the first three cultists who wanted to sacrifice Remina, or why Goda had a tongue similar to planet Remina's when he was dressed as a cultist.
Negative Space Wedgie: Planet Remina came to our region of space through a wormhole, therefore proving the phenomenon's existence. Not that such a breakthrough in astrophysics actually helps anyone...
Oh Crap: The astronomers' reaction every time Planet Remina eats something.
Only Sane Man: The Hobo soon becomes one of the few sane people left, who also happens to be remarkably intelligent and Genre Savvy about the whole situation. He's revealed to be the elder Mineichi son, aka the one who sought to become an astronaut.
Plot Armor: The entire human race gets spun into the stratosphere (literally), and all of them are out to kill Remina and the Hobo. The latter two manage to land unharmed on the numerous corpses of their pursuers.
The Reveal: The tenacious cultist is Goda, the president of Remina's fan club, and the hobo is the older Mineichi brother.
Sanity Slippage: An increasingly large fraction of humanity undergoes this as Planet Remina moves ever closer to Earth. Soon enough, the only sane people left alive apart from Remina are a handful of bystanders and the elder Mineichi son. They also become the sole surviving members of the human race in the end.
Screw This, I'm Outta Here!: While society at large crumbles, the government and what's left of civilization attempt to jump ship for Planet Remina hoping to rebuild there. It goes as well as you'd expect.
Sealed Room in the Middle of Nowhere: once Planet Remina eats the Earth, the only survivors are trapped in an airtight fallout shelter drifting through the now-empty solar system. They have enough supplies to last a year.