Nagisa free-ran up the mountain to the 3-E building. He was in high spirits, eagerly anticipating both his reunion with his classmates and a chance to save his teacher.

Koro Sensei will probably be angry at me for what I did. But I don't care. He'll be alive, and that's what matters.

"Hey Nagisa!" Kayano waved at him from the door to the school building. Nagisa accelerated towards her, eager to catch up.

"Hey Kayano! Are we the first ones here?"

Kayano shook her head.

"Karma, Muramatsu, Itona, Nakamura, Okano, Fuwa, Isogai, and Kataoka are all already here."

As she spoke, Yoshida arrived with Hayami and Chiba.

"Kayano, you mind doing me a favor?"

Perplexed by Nagisa's request, Kayano replied with uncertainty. "Um, sure I guess?"

"Just don't tell Karma I'm here. Don't let Yoshida, Chiba, or Hayami tell him either."

Kayano nodded. "Consider it done."

With a smile of thanks, Nagisa discreetly climbed onto the roof.

The rest of Class E arrived slowly, with Sugino and Kanzaki being the last two in the building. For some reason, they all chose to sit at the desks they had occupied in junior high.

Isogai went to call the group to order before Karma spoke up.

"Has anyone seen Nagisa? I don't think he's here yet."

Kayano shrugged. "Maybe you should go look for him."

Karma nodded. "I'll check his apartment. If he's not there we'll go ahead and start without him."

The class murmured agreement as Karma rose and left the room.

Nagisa crouched in wait above the door to the schoolroom, awaiting the arrival of his target. His knife was unsheathed and dipped in blue ink. Karma stepped out of the door and Nagisa jumped down onto him, inking his throat before he had time to react. Too stunned to react, Karma stood still as Nagisa ran into the building.

Gathering himself as quickly as he could, Karma gave chase. Karma was slightly faster, but Nagisa's head start was too much to be regained.

Sliding into the classroom, Nagisa took his seat. His classmates were confused, but the blue ink on Karma's throat explained everything. Nakamura, not one to miss a chance to mess with somebody, quickly began filming her classmate's fury.

Karma pulled out a tube of wasabi and charged at Nagisa, who nimbly avoided his friend's attempt at quasi-torture.

"You'd think it'd be easier to hit a girl like me." Nagisa taunted.

Karma's rage flared. Seeing this, the Terasaka gang restrained him, and Isogai held down Nagisa.

"Well then Nagisa, it seems you're still just as weak as when you were in middle school." Nakamura indicated the difference in number of people required to restrain Karma as opposed Nagisa.

Nagisa glared at Nakamura with bloodlust in his eyes.

"Unless you want a knife on your throat like Karma here, I'd recommend you stop implying weakness on my behalf."

Nakamura chuckled.

"Alright, learn to take a joke! Anyway, if you two agree to stop trying to assassinate each other we'll let you go. Deal?"

Nagisa agreed immediately, earning him a quick release from Isogai's grip. Karma, on the other hand, took a while to calm down, slinging wasabi themed threats at Nagisa and the Terasaka gang, for assassinating him and holding him down, respectively.

When everybody had calmed down and taken their seats, Isogai called the class to order.

"As you all know, we are here to discuss the possibility of attempting to save Koro Sensei. What's past is past, but Okuda here has suggested the possibility of travelling back in time to save our beloved homeroom teacher. Okuda, you're up."

Okuda nodded and stood, walking to the front while Isogai strode back to his seat.

"How many of you are familiar with Einstein-Rosen Bridges?"

Takebayashi and a few others raised their hands, but the majority looked lost.

"Alright. I'll explain that bit first. An Einstein-Rosen Bridge, or a wormhole, is essentially a shortcut between two points in space. See, space is curved, and a wormhole allows you to travel through space in a straight line as opposed to the curve, allowing for quicker travel. I'm sure a good deal of you are wondering how this helps us travel through time. The thing is, time is curved as well, therefore wormholes between two points in time can exist as well as two points in space."

Nakamura raised her hand. "So, how do we find a wormhole?"

Okuda gulped. "I may or may not already have found one. As you all know, the moon was destroyed nine years ago on March thirteenth."

There was a general murmur of agreement.

"I was considering it a couple years ago, and I thought-" Okuda gulped again. "-I thought maybe the antimatter explosion had been enough to create a temporal wormhole. If I'm correct, it will send whomever manages to get through it to the day the moon exploded."

Takebayashi's face portrayed immense shock. "That could be a revolutionary discovery Okuda! Why didn't you tell anybody?"

Okuda sighed. "The same reason we never told anybody about Koro Sensei's true nature."

Realization dawned on the class. The gag order on Koro Sensei probably extended to the mouse whose... achievements... Koro Sensei took credit for.

"So we're on our own in doing this." Nagisa's comment startled the class out of their heads.

Okuda nodded. "We can't hitch a ride again like we did to get to the International Space Station; the moon moved but the wormhole did not, leaving a good deal of distance between them. They come close every March thirteenth, but not close enough. Furthermore, it is in the nature of wormholes to be unstable. We'd have to stabilize the wormhole with exotic matter, which would be quite difficult to procure. And finally, whomever travels back in time will need a good deal of protection or they'll die a million ways before they make it back. All that not without even mentioning the potential for paradoxes."

Takebayashi considered before replying to Okuda. "There's a lab about forty miles outside of the city that's testing exotic matter. We may be able to swipe some from them. As for getting to space and protection from the wormhole, I don't have a clue."

Kayano joined the conversation. "Could a tentacle being survive the wormhole? Because they could probably make it to space and would be fast enough to stay away from anybody they could cause a paradox by meeting or influencing."

Okuda's eyes widened in surprise. "That might work! I'd have to research it though. And one of us would have to become a tentacled being..."

Kataoka cut through the tense silence in the room. "How about everybody willing and able tries out tentacle stem cells, and whomever retains the most clarity of mind becomes the tentacle being?"

Takebayashi nodded. "That makes sense. Everybody who doesn't want tentacles please make yourselves known now. The remainder will be tested upon once we steal tentacle cells from the Ministry of Defense."

Itona spoke up. "As we all know, I react very poorly to tentacles, so I would like to not be a tentacle tester."

"I would like to bow out for the same reasons as Itona."

Okuda nodded once more. "Right. Neither Itona nor Kayano will be receiving tentacles again. Is there anybody else who doesn't want tentacles for any reason?"

To the surprise of all, Terasaka raised his hand. "I've seen what those things do to people, and I'm not interested. Besides, campaigning is hard when you look like an octopus."

"Alright. Kayano, Itona, and Terasaka are out. Ritsu obviously can't use tentacle either. That leaves 24 viable subjects."

Karma interrupted Okuda's speech. "I think you and Takebayashi should bow out as well. You're the only two people here remotely qualified to perform this experiment, or surgically remove the tentacles if need be."

"Okay then, 22 viable subjects. Anybody else out?"

Two more people bowed out, leaving 20 viable subjects.

"Alright. The list of viable subjects reads as follows. If you hear your name and want out, tell me. Nagisa Shiota; Karma Akabane; Takuya Muramatsu-"

"I'm sorry, but I want out. I have a duty to my family to keep the shop running, and I don't intend to just leave them to manage it."

"Perfectly acceptable. Picking back up from where I left off: Taisei Yoshida-"

"Out for the same reasons as Muramatsu."

"Alright. Yuzuki Fuwa; Hinano Kurahashi; Hinata Okano; Meg Kataoka; Yuuma Isogai; Hiroto Maehara; Taiga Okajima-"

"I'm out."

"Ok then. Rio Nakamura-"

"I'm out too. As a diplomat, I have a duty to my country I can't fulfill with tentacles."

"Right. Chiba Ryonosuke; Rinka Hayami; Yukiko Kanzaki; Toka Yada; Kirara Hazama; Sosuke Sugaya-"

"I'm out. Based on Koro Sensei's Henna abilities, tentacles would totally screw my art career."

"Ok. Kimura Masayoshi-"

"Out for the same reasons as Nakamura."

"Alright. Last but not least, Koki Mimura."

"I'm out as well. I'll help out in other ways, but I have a promising career in directing and I don't want to throw it down the drain."

"Ok. We now have thirteen viable subjects remaining."

Nagisa smiled. This would be one crazy ride, but what better to serve as a reunion for the assassination classroom?