Xxx
A few weeks had passed since the whole incident with the wyvern, now, Ryuga was with Koyomi, Alice, Megumi and Arthur, and they were in a private training area owned by Yogoe's royal family near the academy.
The Pendragon prince watched with mild amusement as Koyomi stood in the center of the rather huge training field. No, huge didn't do it justice, for it spanned for a few hundred meters in both length and width.
Ryuga stood beside him, "Do I seriously need to do this?"
Megumi smiled, "You promised her, did you not?"
Alice grumbled, yet she was doing her best not to smile, "I mean, you promised her, so that's on you."
The young hero sighed, "Me and my big mouth."
Arthur chuckled and patted him on the shoulder, "Come on, it can't be that bad."
Ryuga shook his head, "Nah, it's worse."
He sighed again, "Fuck it, I'll just go and get this over with."
He ran over to the center, where Koyomi was patiently waiting for him, but her seemingly innocent smile didn't help him one bit.
The princess smiled, "Are you ready, Ryuga?"
The young hero brought up his display, "Yeah, let's get this over with."
Koyomi nodded, and she glowed, before growing in size until she was a massive fox. Ryuga stared at the fox, and he contemplated which unit he should use, until his mind settled on one unit that fit this situation.
He quickly chose the unit of his choice, and in an instant, a pitch black Gundam stood in his place, staring down at the fox.
It was the ZGMF-X88S Gaia Gundam.
Koyomi smiled, "Now, let's go!"
She pounced on the Gundam, but Ryuga saw it coming and leapt away. He then aimed his beam rifle and pulled the trigger three times, forcing the fox to dodge.
Koyomi then jumped at him, only for the Gaia Gundam to do the same. But what came next surprised everyone.
As the two neared each other, the Gaia Gundam suddenly transformed into a winged wolf and spun slamming his wings into the fox's face, sending her crashing to the ground.
Koyomi quickly got to her feet, "So you can do that too."
It was amusing, to say the least. She's had her fair amount of sparring in her giant form, her sister had made sure of it, and Koyomi was confident she could hold her own.
The giant fox pounced, and the Gundam responded in kind. The two beasts smashed their heads against each other, before forcing each other away as they landed with a loud boon.
Ryuga let out a breath as he willed the Gaia Gundam to take to the skies, and Koyomi leapt upwards in response.
The fox tried to swing her tails to smack the Gundam, but the Gaia Gundam swiftly changed back to its MS form, easily grabbing her tails. Koyomi blinked, "Eh?"
Then Ryuga spun, swinging the giant fox around for approximately 10 times, before releasing his hold on her tails, sending the Yogoe princess crashing into the ground.
Alice burst out laughing at that sight, while Arthur had an amused smile, and Megumi doing her best at keeping a poker face.
As for Koyomi herself, she was seeing stars, and as soon as she regained her bearings, she glared up at the Gundam half-heartedly, still floating in the air, "I'll get you for that."

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Reincarnated into Another World with Mecha
AdventureI died. The fucking truck driver ran me over. But a god saved me.... Sort of.... Gave me another chance to live in another world as a Hero. Is this an Isekai-trash trope? Yes, but not a standard one. Instead of the usual knights and magic, this god...