Eh. I don't know what to say. Um… I guess… Zane is finally writing? Yay? Also, grammar mistake last chapter. The sentence "'Hmmm. Is that?'" is supposed to be "'Hmmm. Is it?'" *Cue Music* I'M ONLY HUMAN AFTER ALL!... or… am I? Cue dramatic sounds. Don't forget that the underlined and italicized words are Zane's author notes.

One by one, students field into the classroom, monotonically shuffling to their individual desks, giving off an aura of listlessness and basic sadness. A second later, the door opened and the yellow creature from before slid up to the front, picking up the roll sheet. Everyone eyed him. Completely ignoring this, he announced, "All right class. When I call your name, tell me that you're here. Yuma?"

However, it was Nagisa that stood up before Yuma, in his raised hand was a government-issued pistol, which he fired from while this being as the thing was preoccupied with the clipboard he was clutching. Being slightly flustered, he immediately deflected the shot with the clipboard as Nagisa emptied his clip before lowering the board and turned back to Nagisa. "Tsk, Tsk Nagisa. To slow. Nururufufufu."

Nagisa rolled his eyes, glancing at the people staring at him. "What?"

"Nothing. It's just that… you're usually not this… composed?" Yuma said.

Nagisa just looked at him.

"Well, there's a lot of things you don't know about me Yuma. Plus, killing him IS our top priority."

Raising an eyebrow and wondering if Nagisa was always like this, Yuma stood up with a Minebea P-9, modified to shoot BBs. "Speak for yourself."

On cue, the whole class got up, whipping out throwing knives and firearms to try to blast Korosensei into oblivion. But alas, due to the class's horrible aim from their lack of training and the speed of the creature, the class failed to land a single shot. Everyone was panting from exertion and frustration apart from Nagisa, the kids looked on in awe and anger as this thing stood unharmed.

"I can't be killed that easily, you'll find." the thing gloated.

"But these are just plastic BBs. For all we know, you just took 'em like a champ."

He sighed, scanning the room's floor that was covered in BBs. "Collect all of the BBs and bring them here."

As the class went about cleaning up the mess, the thing plucked the pistol out of Sugino's hand, aiming it at himself.

"As you can see, the BBs do nothing to you. However…" It fired the gun upon his own tentacle arm, instantly severing it with a pop. "...The BBs can cut through my cells like a knife through hot tofu." he concluded, the class's face watched in horror.

Nagisa had eyebrows raised at that sight. Nakamura then spoke up asking, "So what do we call you? I mean, we can't just keep calling you Weird-Yellow-Space-Tentacle-Monster-Thing-Sensei can we?"

"Yeah, that's true. Hm. I guess I will just let the class decide this then. Nururufufufu."

"Um. Well, Korosa Reni means 'Can't be killed' and 'Sensei' means teacher. I guess we can call you 'Koro Sensei'. It's accurate and also a play on words." Kayano said.

The class started muttering to each other, saying things like "Yeah, I like that."

"Koro Sensei eh? Hm. So that is what you will call me now. Nururufufufufu!"

As the class filed out at the end of the day, Nagisa stayed behind. "So. Koro Sensei. Not ."

Korosensei's smile widened as he slithered out of the classroom, Nagisa following close behind. "Sir, may I ask what has happened to you? You've changed a lot in the short span of a year."

"Well, a lot of things can change in a year. That's 12 months, 52 weeks, 365 days, 8,760 hours, 525,600 minutes, or 31,536,000 seconds. And I will tell you. Just not today."

"But why? I mean, you just left me and then a year later, you turn into this."

"I know. But I just can't tell you…"

"Can you at least tell me why you wanted to teach?"

"...I… maybe another time…"

Right when Korosensei finished speaking, Nagisa whipped out one of his rubber knives. Korosensei flinched away, sure that Nagisa was going to slash him, only for Nagisa to throw it behind him, bouncing off a nearby door."I know there's someone behind that door. Come out."

Kayano sheepishly stepped out from her hiding spot, a little bit flustered at Nagisa's amazing hearing."Kayano? What're you doing here?"

"I just saw you walking with Korosensei. I was going to leave, but I heard you say 'what has happened to you?' So you've met him somewhere before?" Kayano whispered.

Nagisa's composed look slipped for just a second, showing a mix of bewilderment and surprise. Damn it! How did I not notice!? "I don't know what you are talking about. Now, if you'll excuse me, I should probably go home soon."

Nagisa left the two behind in the dust, as he ran off to whatever his next destination was.