Takayama Gamu was not from this world.
Before arriving in this unfamiliar place, he had been restarting quantum mechanics experiments at Jōnan University, entering the realm of particle acceleration for the second time.
The first time he stepped into the particle-acceleration domain, he encountered the consciousness of Earth itself and was granted the Light of the Land.
The second time, he saw three glowing girls—with horse ears.
And then, Takayama Gamu was pulled into this world.
In this world, he possessed the same "identity" he'd had on Earth: a seventeen-year-old PhD in quantum mechanics, a rising star of Jōnan University.
At the same time, he was also a pitiful examinee who had registered for the Central Trainer Exam with only two months to prepare.
It didn't take much imagination to figure out whose work this was: those three horse girls known as the Three Goddesses.
At first, Takayama Gamu dreamed of building a time-and-space travel machine to return to his original Earth.
But the moment that idea formed, every night thereafter he would dream of those three glowing horse girls.
They would grab his hand and whisper in his ear:
"Be a trainer for life, isshō ni!"
"Don't leave! Onegai!"
"Gamu… Gamu… Gamu… Gamu…"
It didn't actually interfere with his rest, but the feeling it gave him was… extremely weird.
And Takayama Gamu was exactly the type who responded to softness, not force. If they had tried to keep him by using some time-controlling monster, he would've transformed into Ultraman Gaia and fought his way out.
But instead, they used this shameless, pleading method…
He had to admit it:
It worked.
Gamu decided to try being a trainer.
Up to this point, everything was still normal.
Until one day, an acceptance letter from Tracen Academy arrived in his inbox.
"Recipient: Gaia"
Only then did Takayama Gamu realize that, in this world, using the Esplender to transform didn't just turn him into Ultraman Gaia—
It could also turn him into a horse girl named Gaia.
No need to think about it: the enrollment application to Tracen Academy had obviously been submitted by the Three Goddesses on his behalf.
So what—he was supposed to disguise himself as a horse girl and attend an all-girls school like Tracen Academy?
Takayama Gamu immediately chose the path of not attending.
Unfortunately, what you're meant to face eventually catches up to you.
As Tracen's student council president, Symboli Rudolf was now sitting right in front of him, asking about Gaia.
In front of horse girls, lying was absolutely impossible—this was common knowledge among trainers.
"S-She… doesn't really want to go to school," Gamu said weakly, feeling his integrity shattering into pieces. "But she'll come to report tomorrow."
"What time tomorrow?" Rudolf pressed.
"Probably… before seven?"
"Then there's no problem." Rudolf picked up the photo again and studied it. "Trainer Gamu—our student council will help you supervise Gaia's studies."
This was the first time in Central Tracen Academy's history that a student hadn't shown up to enroll. Rudolf was deeply concerned.
School refusal?
That was rare.
Her fingers tapped unconsciously against the solid wooden desk.
Then they would have to supervise her properly.
A Central horse girl didn't just need to run fast—academics mattered too.
"N-No, that won't be necessary!" Gamu panicked and waved his hands. "I'll manage her. I won't trouble you, President!"
"It's fine, Trainer Gamu." Rudolf smiled calmly, confidence in her voice.
"As Japan's highest institution for horse girls, Central Tracen Academy naturally has a complete training and educational system. The student council has considerable experience in how to educate naughty horse girls."
"We'll make sure you're satisfied."
That's not what I meant…
Takayama Gamu realized the situation was developing in a profoundly bad direction.
...
"Paal, help me search for the daily routine of students at Japan's Central Tracen Academy."
Inside the private training room assigned to Takayama Gamu by Chairwoman Akikawa Yayoi, he sat in an office chair and spoke to the anthropomorphized aircraft model displayed on his computer screen.
After deciding to become a trainer, the first thing Takayama Gamu did was rebuild Paal.
Paal had originally been the EX's auxiliary navigation system. For data-analysis purposes, Gamu had upgraded it into a reliable AI.
This world's hardware computing power was far beyond that of Gamu's original Earth. Paal's analytical ability turned out to be even stronger than he'd expected.
"Understood, Gamu."
A flat mechanical voice came from the computer. Paal's eyes narrowed sternly as the progress bar above its head rapidly filled.
"Compilation complete, Gamu."
"Good. Thanks, Paal."
Gamu stared at the screen.
"Wake at 6:00 a.m. After a five-kilometer morning run, breakfast. Then cultural classes from 7:30 until 12:30. Lunch break until 2:00 p.m. After that, group instructors conduct running and dance training. After 5:00 p.m., students are free."
Though it was called "free time," in reality, most horse girls were training on their own.
"Sounds pretty relaxed," Gamu muttered.
"But I still don't want to sit through classes."
He leaned back in the chair and looked up at the white ceiling of the training room.
He was a prodigy who'd skipped grades all the way to earning a doctorate at seventeen. Forcing him back into high school-level classes would be no different from wasting time.
"Whatever. Looking on the bright side… at least I can freely use Gaia's power now."
He pulled the Esplender from his coat and called out unwillingly:
"Ga… Gaia…"
In an instant, red light wrapped around his whole body. A moment later, the glow faded—and the horse girl from Rudolf's photograph stood there.
Short, shoulder-length silver hair gave her an elegant, mysterious aura. Her face was small and exquisitely refined, like an artwork carved by a master. Her pale yellow eyes shimmered with a gentle light.
A single ahoge at the top of her head flipped back into a playful arc.
Across her shoulders, two golden stripes extended along a silver-and-red tracksuit patterned similarly to Ultraman Gaia's body markings, outlining graceful curves across chest and back. At the very center of her silver chest, a life indicator like a pure gemstone emitted a healthy blue glow.
Takayama Gamu—or rather, the horse girl Gaia—covered her eyes.
"Ch… ch… Hah!"
Gaia's expression didn't change at all. Her rosy lips parted slightly as she made an angry sound—
And yet it somehow came out… cute.
After transforming into horse-girl Gaia, Takayama Gamu couldn't change his facial expression—he couldn't even speak normally.
In this world's internet slang, horse-girl Gaia was the definition of a silent-type beautiful girl.
To solve that problem, Takayama Gamu rummaged around the training room and found a portable whiteboard and several marker pens.
They'd been left behind by the room's previous owner. Supposedly that person had been training horses just fine—then suddenly vanished. When Secretary Hayakawa Tazuna brought Gamu in to settle his things, she only smiled faintly and didn't offer any details.
Maybe something special happened—something that forced an early retirement.
"Hello everyone, I'm Gaia."
"(●'◡'●)"
Horse-girl Gaia wrote on the whiteboard.
Takayama Gamu decided that whenever he was in Gaia form, he would communicate using this board.
To be polite, he also skillfully drew a kaomoji he often used.
He hadn't used modern sticker packs much. On the Earth where he'd been born, online communication still relied on kaomoji—and as a member of the Alchemy Stars, he was very familiar with them.
Staring at his own reflection in the mirror—holding a whiteboard, wearing a cool, aloof expression—Takayama Gamu prayed that tomorrow would go smoothly.
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