"Done."
Exhaling the turbid air, Hii Kōri inscribed the final rune on the scroll, declaring the storage scroll complete.
Unlike conventional sealing techniques for sealing objects, storage scrolls involved space–time ninjutsu applications—applying sealing techniques was more difficult.
During inscription, if the sealing formula reacted with the scroll's inherent space–time ninjutsu, the entire scroll could be easily damaged.
Similar to sealing techniques facing resistance when sealing others, or genjutsu failure when disrupted by the target's chakra—fundamentally, chakra conflict.
The larger the storage space desired, the more complex the required space–time ninjutsu, and the harder to inscribe sealing formulas avoiding traces of technique.
Hence storage scroll prices are directly proportional to different space size, and inversely proportional to scroll dimensions.
Notably: storage scrolls absolutely cannot contain another storage scroll.
Paper or cloth-based ninjutsu created by space–time ninjutsu weren't stable enough. Even With sealing constraints, superimposed different spaces risked collapse, and rendering storage failed.
Traveling through time to past or future, damaged by spatial distortion, or simply drifting to other spaces... Exploding on the spot would be the best outcome.
Hii Kōri's completed storage scroll had capacity roughly a quarter of this study room—about 36 cubic meters. Excluding redundancy, usable capacity around 34 cubic meters.
Not particularly large for this scroll size, but sufficient for their three needs.
Yes—while meant to show results to the school, Hii Kōri wasn't turned in this scroll. At least not yet.
This study room was assigned as their student activity room. Naturally, they'd arrange it properly.
Bookshelves, blackboards, desks—learning essentials. Training equipment and seating areas are also necessary. All frequently used but difficult to store odds and ends would be tucked into the scroll, eventually wall-mounted.
Within the scroll, placement wasn't an issue—space utilization far exceeds that of the classroom.
"Different space structure... normal. Storage function...normal operation. Sealing technique no problem. Quite successful try."
Casually stuffing it in and then taking out the just-used inscription pen, Hii Kōri happily shook his head—not from pride, but pure delight in mastering new technology.
"So all that stuff can go inside now?"
Holding his left arm, Karura looked up, pointing to the pile in the corner by the window. Besides weight plates, dumbbells, and training equipment, assorted clutter remained: Hii Kōri's tools and parts (purpose unknown to the girls), Karura's medical ninjutsu notes, various medicinal ingredients...
Even an anatomical model—Hii Kōri's teaching aid for guiding the girls in taijutsu.
Storing everything inside would make the study room much more spacious.
"First, I'll teach you how to unseal this scroll."
Extracting his arm from Karura's loosened grip, Hii Kōri clapped, drawing the girls' attention.
"Basic reusable sealing technique—principle like unlocking a mechanical lock with a key. Inject chakra here, then unlock in predetermined order."
After storing all clutter into the scroll, he pulled out a folding table near the window, placing the scroll and two cups on it.
"Want to try?"
"Okay~" "Yeah, coming."
Responding, Karura and Pakura approached. Following his guidance, they attempted to send cups into the scroll.
Predictably, Karura succeeded easily. Pakura, however, struggled.
"Need to turn faster here."
With an expectant expression, Hii Kōri took Pakula's hand from behind, guiding her chakra injection to unlock the seal.
"Mmf... Got it."
Such ambiguous positioning stimulates Pakura—her face instantly reddened. But she followed Hii Kōri's guidance for another attempt.
Though their guidance had dramatically Improved accuracy in Pakula's chakra operation, accumulated habits since learning weren't easily corrected.
Lacking confidence in her operating ability, she injected chakra too cautiously. Speed insufficient—failed to unlock.
"This is a common anti-hacking measure for protecting valuables with sealing techniques. Often paired with self-destruct formulas locking storerooms. No need to memorize—rarely used, won't be on exams."
Pakula nodded.
Meanwhile, Karura's attention fixed on Pakura—hand-held from behind by Hii Kōri.
What's this?! How's this different from hugging?!
Thus internally accused, the cute rabbit puffed her cheeks and coquettishly at Hii Kōri.
"Hey, Kōri~ I didn't learn either—whoa!"
"Stop fooling around."
Two fingers slightly curved, he lightly tapped Karura's head as punishment. Eyes narrowing: "Little Rabbit, haven't you been meaning to submit that 'Tenketsu Unlocking Technique' analysis?"
"Working on it~ But two thousand words on ninjutsu analysis is too hard~"
Karura crouched, covering her head, grievance whining.
Can't finish! Absolutely can't finish!
Medical ninjutsu, saving lives rather than killing, demanded absolute precision. Such topics naturally require more brainpower.
She was only six!
Medical ninjutsu basics aside—who makes kids this young write technique analyses?!
"Devil! Kōri's a very, very bad devil!"
Pouting, looking up at Hii Kōri with a triumphant smile.
"Ha... fair point."
Sensing he might have pushed too far, Hii Kōri scratched his fluffy red hair, then proposed a tempting offer: "One thousand—no, eight hundred words. Write that, and I'll give you a reward. Deal?"
"Really?"
"Yeah."
"Yay!"
The rabbit-girl literally jumped like a rabbit.
***
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