Seisen flopped back into his chair and scratched his scalp, staring at the mangled booklet in the trash. He felt a little stuck about his upcoming lecture.
Maybe he could borrow someone else's booklet?
Even if he was a "scholar," teachers needed textbooks to teach. He couldn't just walk into class empty-handed—Seisen respected bookmen more than anything.
He shot a look at a chūnin teacher with a scruffy beard, head buried in his desk. "Hey. You. Lend me that Ninja Code of Conduct for a second."
The bearded teacher raised his head in confusion and handed it over.
"Seisen, did you lose yours?"
"Ha. Me, Shiba Seisen, make a mistake like that?" Seisen grinned with a simple, honest look and waved the question away.
The bearded teacher felt something was off, but he was busy and didn't dwell on it.
Seisen opened the booklet again and pulled out a pen. This time he didn't act on impulse—he began writing comments in the margins.
He crossed out MISSION PRIORITY OVER PERSONAL LIFE and rewrote IN HELL YOU WILL. Next to ABANDON TEAMMATES IF NECESSARY he scribbled in red:
EVEN IF THE KING OF HEAVEN COMES DOWN, YOU CARRY YOUR BROTHER'S BODY HOME!
"Mmm." Seisen nodded, satisfied with his edits.
Ding-ling-ling~ The class bell rang on time. Seisen stood up, hitched up his pants, and marched toward the classroom like a general headed to war.
Meanwhile, the students were half-asleep.
Normally first period had the best energy, but today's class was taught by the most strict and meticulous teacher in the academy—Shiba Seisen—and lately they'd been stuck in the driest material: Ninja Code of Conduct.
Basically moral education.
Necessary, sure. But to kids, the textbook felt like dust.
Konohamaru sat by the window near the edge of the classroom, spinning his pencil and thinking about how to improve his "harem technique."
Big Brother Naruto had only visited him once recently before throwing himself fully into training. Now Konohamaru had nothing to do—and still had to sit through a boring theory class.
It made no sense.
"Aaaah…" His soul died a little. If Seisen didn't care so much about attendance, Konohamaru would've slipped out to play already.
Then—
THUD THUD THUD!
Footsteps thundered in the hallway.
Konohamaru jolted. That didn't sound like Seisen. Did they switch teachers?!
His face lit up—only to see a thick, powerful figure in the doorway, eyes fierce, forehead creased with deep lines, eyebrows like living dragons.
The children fell silent. Something felt strange.
Seisen looked… different today.
Only Konohamaru wore the face of someone who'd just seen a swimsuit photo of an ancient grandma—his mood immediately crashed.
Still this fossil.
But Seisen felt the opposite.
Yes! I'm a teacher now!
His blood surged with excitement, impossible to contain. He strode onto the platform, slammed the booklet onto the desk, planted his hands on his hips, and rolled his neck.
"Alright, students—no, I should say, Konoha brothers! If I ever did anything wrong before, offended you, made you resent me—hold it in your hearts and bear with me, yeah?"
He swept his gaze around, beaming like he'd become a battlefield commander. Then, abruptly, he raised his voice:
"Of course, whether you bear with it or not, you're gonna bear with it anyway! What else are you gonna do?!"
The children stared, shaken, exchanging looks like their world had cracked. If they'd ever read canon, they'd be convinced they'd fallen into an Infinite Tsukuyomi.
"T-teacher…?" someone whispered.
"Hm?!" Seisen's hawk-like eyes locked onto the bespectacled girl in the front row—the top student in theory.
"We… don't have any complaints. Could we start the lesson?" Her voice was tiny. Seisen had scared her.
Seisen nodded in approval—and got even more fired up. "Heh. And you couldn't beat me even if you did! Tell you what—anyone who's got a problem, come up here right now and spar with me!"
The classroom turned into a grave.
No one understood what the hell was going on.
That's transmigrators for you: they can go mad however they want. Canon NPCs have to worry about consequences.
Yet by the window, one kid sat up straight.
Konohamaru didn't understand anything either—he just felt that listening to Seisen today was weirdly exhilarating.
"Alright." Seisen slapped his sleeves up. "Today we talk about what the hell the Will of Fire really is."
He grabbed chalk and wrote huge characters on the blackboard with a scrape-scrape-scrape. When he finished, he looked at his own writing with pure self-admiration.
So this is what it feels like to write on a board. Love it.
Seisen turned around and saw everyone opening their textbooks. His face instantly hardened. "Close them. All of them. Now."
"…Huh?"
"What's wrong with Seisen-sensei today?"
"He always said the textbook is the most important…"
The confusion they'd been swallowing finally burst as whispers spread through the room, quickly growing loud enough to drown him out.
Seisen narrowed his eyes. He wasn't surprised. Back in his day, he'd been the troublemaker too—the one the leadership had to hammer into shape. Everyone had a wild phase.
He raised one hand.
Chakra gathered in his palm like instinct.
Then he slammed the desk with all his might.
BANG!!
The sound hit like an explosion. Girls screamed. Boys covered their faces. The classroom erupted, desks rattling and clattering.
"You bastards won't listen, huh?!" Seisen roared, eyes blazing. "Look at you—using some damn textbook in class! When an enemy shows up, you gonna kill him by throwing a book at him?!"
The students were stunned.
So… you don't use textbooks in class?
"Listen up!" Seisen paced like he was carving trenches into the platform. "I've studied the Will of Fire. It's simple. You don't need this trash book at all!"
He slapped his muscle-packed chest, voice ringing like a war drum.
"The Will of Fire is a spirit! When you meet your enemy in a narrow path, the brave man wins! Even if you know you can't win, you draw your sword anyway! Even if you fall, you become a mountain—a ridge! Burn yourself to light the way for others!"
In the chaos, Konoha's young seedlings were being force-fed something like fertilizer. The flavor was harsh, but damn—there was nutrition in it.
Konohamaru leapt to his feet, fired up for reasons he couldn't explain. He just felt Seisen-sensei looked unbelievably cool today.
Outside the classroom, in a shadowed corner—
Iruka stared at the scene, his body turning ice-cold.
"I have to report this to the Hokage…" he whispered, hands trembling as he fumbled out a handkerchief and wiped sweat from his brow.
But Seisen had no idea about ANBU interrogations and memory-reading. All he knew was that teaching today felt incredible.
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