Deathtopia is a purebred vampire, possibly being the longest living one known to man. She is very arrogant and prideful, urging others to use the name that she created for herself.  She is known for the long, bizarre names she creates. Her many deaths and lack of eating have caused her to shrink, much like Shinobu.

As a vampire, Deathtopia has created many minions, including Tropicalesque, and more notably, KissShot. She has had many minions in her life, but almost all of them have rebelled, besides Tropicalesque. Deathtopia, however, likes the minions that rebelled over how loyal Tropicalesque was. Deathtopia was also the one who had saved Princess Acerola from her curse of beauty. ~!Deathtopia had originally manifested through the hatred for a tyrant that was known as the "Corpse King," who resided in the Corpse Castle. The king had caused many deaths in the long-forgotten kingdom, eventually being overthrown, and the subjects moving to another castle. Deathtopia, after manifesting, resided in the Corpse Castle as her new home.!~

Shinomonogatari Vol. 1: ~!After KissShot had left to her own endeavours, Deathtopia had at some point consumed the remnants of Tropicalesque. After Deathtopia saved Acerola from her curse and turned her into a vampire, Acerola's curse went dormant within her.
In the modern-day, Deathtopia is near-death from a virus that only infects and kills vampires. She looks like a withered tree and is near-death when Koyomi and Shinobu arrive at Corpse Castle and see her.
It's discovered that the vampire virus formed from Deathtopia's late thrall and servant, Tropicalesque, after his will merged with Acerola's dormant curse. However, it was still dormant for centuries, until Deathtopia met Shinobu again in Shinobumonogatari. It was then that Tropicalesque's primal hatred and jealousy flared up and began a desire to return Shinobu to a human. It ended up backfiring, leading to the deaths of vampires, along with the virus being unable to reach her and ultimately infecting his own master. 
To stop it from causing more harm and killing Deathtopia, Shinobu must suck it out of Deathtopia. This, in turn, turns her into a human, despite being purebred. Sometime after the fact, Deathtopia dies from the virus affecting humans, Covid. Shinobu says she had at least enjoyed the years as a human and didn't die from suicide, which is what she typically did die from.!~

It's chic to go saving a girl who has nothing to do with you every once in a while. Female students from Naoetsu High School have gone missing one after the other. When the mummified bodies of the girls are discovered, there's a very distinctive marking left on the napes of their necks...? Koyomi Araragi, now a first-year university student, goes on the move to track down the culprit! The curtain opens on Monogatari Series: Monster Season!
 
(Source: Kodansha, translated)

Around 600 years from the present day, a now-destroyed country was where the girl called the "Fair Princess" had lived. With such beauty that anyone would offer one's life for, the road the girl trod on became a mountain of corpses.
 
These are the legendary oddities! Oddities! Oddities!
 
Youth is cruel like a fairy tale.
 
(Source: Kodansha, translated)
 
Note: The Princess Beauty short story is included in the chapter count.

Volume 1: 
"All I ever see in thee is the visage of death."
 
Shinobu Oshino and Koyomi Araragi set off to meet Deathtopia Virtuoso Suicide-Master in her homeland, the tentatively named Kingdom of Acerola. As the humans fall into a state of disorder, the vampires are being wiped out by a virus that only infects aberrations?
 
This is the modern era of oddities, oddities, and more oddities!
 
Youth is by your side, alive and well.
 
Volume 2: 
"Good night, sleep tight, and sweet dreams."
 
As a specialist in training, Nadeko Sengoku heads to Iriomote Island with Yotsugi Ononoki and Deishuu Kaiki. Their target is the snake charmer Uroko Around— the root of all evil, and the biological daughter of Izuko Gaen. What will be the outcome of Nadeko's deathmatch?
 
This is the modern era of oddities, oddities, and more oddities!
 
Thank you, youth. Until we meet again.
 
(Source: Kodansha, translated)

The sequel to the 'Final Season' story arc of the Monogatari series. 

From the past to the future, their story continues. 

Now that he has graduated from high school, Koyomi Araragi’s story ends here. His story is truly over now, but the stories of the girls Koyomi saved - their stories - are not over yet. 

This is the prequel or sequel to their stories and their struggles. 

(Source: Monogatari Series USA Official Website)

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