In this world, what we call “horses” are known as Ponies. There are three main kinds. The most common are Earth Ponies—those without horns or wings—also called non-sorcerers. Sorcerers exist as Unicorns and Pegasus. Unicorns are Earth Ponies with a horn that produces cursed energy and allows them to use cursed abilities, though Earth Ponies cannot see their horns. Pegasus are Earth Ponies with wings; while less advanced than a horn, their wings still generate cursed energy, and they often specialize in Shikigami.
There is also a fourth, extremely rare type: the Alicorn. Unlike Unicorns and Pegasus, Alicorns can be seen by Earth Ponies. They possess both wings and a horn, and only three exist—Satoru Gojo and Tengen. Considered royalty and godlike, Alicorns stand above all others. Gojo, the strongest Alicorn, is known as the King of Sorcery, while Tengen remains far less visible than him but is known as the God of Protection.
A young, cutie-markless Earth Pony woke up… Somehow held down to the ground by cursed energy. Across the room is a blind-folded Alicorn?! Yuji opened his eyes slowly, he was regaining composure… He heard a low voice coming from the Alicorn Pony in front of him.
Gojo: “Good morning…”
Gojo sat across Yuji with a smirk. Yuji noticed Gojo, he looked to the right in slight confusion.
Yuji: “Hm…?”
The Earth Pony saw the horn of the Alicorn glowing, it's very clear it's Gojo that's holding him down. But he was too tired to acknowledge it. Gojo spoke again…
Gojo: “So which one of the 2 are you right now?”
Yuji: “Hey wait… Aren’t you…?”
He finally recognized it's an Alicorn.
Gojo: “Satoru Gojo, I’m head of Sorcerers."
Yuji: “Sorcerers…?”
Gojo kept his playful and unpredictable smirk on. Yuji lifted his head up, slowly waking up more. Suddenly, Yuji remembers a Pegasus named Fushiguro.
Yuji: “Fushiguro… Where is he?!”
Yuji tried to stand up but he realized the cursed energy being used to hold him down will keep him held down. Yuji never experienced cursed energy as far as he currently remembers. Not surprising 'cause no Earth Pony would know cursed energy.
Yuji: “Huh…? What is this…?”
Gojo: “I wouldn’t be worrying about others right now, Yuji Itadori…”
Yuji gasped lightly at this man knowing his name, he looked at Gojo. Gojo’s amusement didn’t falter.
Gojo: “You see, it’s been decided that you’re to be secretly executed.”
Gojo started telling the whole story. He explained it all in great detail… Recapping Yuji that he ate Sukuna’s horseshoes and became the Sleipnir's vessel. Gojo ended off his recap by telling about how Megumi made a request for Yuji to not be killed.
Gojo: “But the end result is still… your execution.”
Gojo smirked at Yuji’s 'Why me?' shocked face pony-expression.
Yuji: “Your recap doesn’t match with the current events!”
Gojo: “Hey, sorry, I did my best. You still have to die but I got your sentence suspended.”
Yuji: “What ‘suspended’ mean? You’ll wait until later to kill me?”
Gojo: “Yup, I’ll just explain it from the top.”
Gojo pulled out a horseshoe of Sukuna’s from his pony-outfit pocket, an identical one to what Yuji ate.
Gojo: “This is the same kind of cursed object you ate. There are 16 of these in total. We possess 3 of them.”
Yuji questioned if Gojo means by ‘16’ if he meant this 'Sukuna' is a horseshoe collector. Gojo chuckled lightly and explained it was 16 horseshoes because Ryomem Sukuna 8 foreleg pony, called a Sleipnir. Gojo then explained about how Sukuna, in the ancient pony times, had wore 2 horse shoes on each hoof. And when his soul was split among the horseshoes after defeat, the horseshoes literally couldn't be destroyed so that’s where Yuji would come into the plan and eat all 16 horseshoes before getting executed—this way the ancient evil Sleipnir dies permanently with Yuji, the non-sorcerer Earth Pony. Thousands of future ponies would be saved.