"Musashi, can you cut it down?"
Miyamoto Musashi smiled brightly. "Of course. That's why I came here, Master."
Without another word, Shirou Muramasa raised his hand. The mental world trembled violently.
This body is made of swords…
Boom!
Under Musashi's horrified gaze, the colossal blade behind the mountain of swords — a sword that pierced heaven and earth — rose into the sky. Countless longswords dissolved into streams of light, raining upward in a torrential storm that turned the world upside down.
Musashi's face paled. "I've never seen anything like this… Master, you're not seriously trying to kill me just because I teased you earlier, right?"
The sky split apart under the crushing pressure of swordlight. Clouds tore as if by divine hands, blazing brilliance flooding through. The sheer force of it all shattered the mental world itself.
It wasn't Shirou's power alone — it was the immaturity of his domain. With the aid of the Efficiency Enhancement Pill, he had touched the realm of Infinity itself, weaving the origin of the sword into the very fabric of the world.
Two absolute realms collided: [Infinity] and [Emptiness]. Swordsmanship pushed to the threshold of true magic.
And Shirou, burning with the instinct of his Origin, could not resist the urge to clash against [Zero].
Musashi lifted her gaze to the broken heavens, hair whipping in the storm. She exhaled deeply, then shouted:
"Master, I love the sword, but I hate battles with no victor! If you don't treat me to udon after this contract ceremony, I swear I won't forgive you!"
The fifth force answered her will.
Calmly, she raised her blade with both hands.
When the mind is empty, the sword is empty.When the sword is empty, the mind is empty.Mind and blade — as one.
"Namu Amida Butsu… the heavens are boundless and free."
"The two oppose, the two transcend."
"Inclusion leads to understanding. Narrow, refine, conclude. There is no second answer."
"Zero's Heavenly Edge is the truth of my sword and my heart!"
Her blade flashed.
Zero's cut met Infinity's rain of swords head-on.
And in that instant—
—the mental world collapsed into nothingness.
Both Zero and Infinity were swallowed by the void.
When Shirou awoke, he found himself in a warm, soft place. His body felt weak, yet lighter — proof that the transplantation had succeeded.
"Not bad," he muttered.
The room was a guest chamber in a hot spring inn. Beneath him was a bed, and around him… a pair of snow-white arms holding him tightly. He didn't need to guess whose they were.
Shirou looked up into Musashi's light-blue eyes. She smiled, wearing only simple indoor clothes, armor set aside.
"The contract ceremony was a success?"
"Of course," Musashi replied with a grin. Then, loosening her embrace, she immediately began kneading his cheeks mercilessly. "But, Master, you didn't say that transplanting magic circuits would be that dangerous! What kind of cheat-code mental world was that!?"
Her hands pulled, squeezed, and stretched his face like dough. Shirou, pinned, simply accepted his fate. Resistance was useless.
Thankfully, her strength was gentle — enough to fluster him, but not hurt.
"…Still, thanks to you, I managed to break through my limits."
"To celebrate that, and to punish you for scaring me—" she beamed, pumping her fist. "I've decided! Today we'll eat, drink, and enjoy ourselves!"
"…Send me back first," Shirou said flatly.
After a transplant, he needed to use Time Wrap to restore balance.
"Eh? Master, you don't get it? Eat, drink, play, have fun!"
"…Do whatever you want."
Musashi tilted her head. "But if you're gone, it's boring by myself. That's missing the most important part of the fun!"
Shirou froze.
Before he could react, Musashi hugged him close, rubbing her cheek against his. "Don't worry, Master, I won't do anything weird. Just stay with me and enjoy it. Celebrating alone is too lonely!"
Her voice dropped to a whisper near his ear.
"…Besides, Master has no right to refuse."
"Yoshi yoshi yoshi~" She affectionately rubbed his face again. His cheeks were soft and warm — unbearably cute to her.
And once again, Shirou realized the obvious truth: reasoning with a Berserker is impossible.
"By the way, Master. Want to see something neat?"
"…What?"
"My magic circuit."
Before he could protest, she undid her corset and lifted her shirt just enough to reveal a glowing green sword-mark etched on her flat, pale stomach.
The transplanted circuit, fully fused into her body.
Shirou's expression twitched. The placement… was way too suggestive. The impact on a teenage boy's heart was immeasurable.
He swore he hadn't done it on purpose.
Feigning calm, he asked, "Any rejection symptoms?"
Musashi shook her head. "Nope. Actually, the connection between us feels stronger than ever. I can sense your condition and location through the circuit."
She placed a hand on her stomach and, after a pause, murmured:
"…It feels like I'm pregnant."
"HEY. HEY. HEY!" Shirou nearly fainted. Do you realize what you just said!? Do you know how illegal that sounds!?
He slapped his forehead. Every time he thought Musashi had bottomed out, she found a way to dig lower.
"Master," she said suddenly, "you'll take responsibility, right?"
Shirou bristled—only for her to break into a goofy grin. "Kidding! Buddha said once you have a family, your sword gets dull."
"…Buddha said that?"
"No, you said that!"
"Pretty sure that was Zhou Shuren, actually," Shirou muttered.
He froze. He'd done it — he'd tsukkomi'd her. That was dangerous. His IQ had dropped to match hers.
Musashi blinked. "Wait, someone actually said that? Damn… and here I thought I'd discovered a great truth on my own. Guess the swordsmen of this world beat me to it…"