A loud bang was heard. The back wall of the classroom crumbled. A boy with silver hair stepped in. He took an empty seat behind a black haired girl. "I won. That wall is nothing compared to me. 1-0".
"Use the door", the class screamed. Manami stared at him. The boy acts as if he owns the place. She didn't like that. His sharp eyes stared back. She hides behind her chemistry book.
"Say, Itona-kun", Karma called him with a name Ritsu mentioned at the start of class. The drizzles of the outside world greets his words. "It's pouring rain outside and you're not carrying an umbrella. So how come you're not drenched?"
Itona stands beside his desk. He pats Karma on the head. "You might be the strongest one in class. But don't worry. I'm not here to pick a fight with someone weaker than me".
Itona walks to the front. Karma tidied his hair. Itona looked at Koro-sensei at the front. "After all, there is someone stronger who I have been meaning to challenge; You". He points at him.
"What refreshing bloodlust, Itona-kun", Koro-sensei said. His face is decorated with green and yellow stripes. "But in terms of strength, I'm not sure that I will be overpowered that easily".
"That wouldn't be a hindrance, since, after all", Itona said. He takes out his own toffee. "We are brothers by blood".
The desks rattled. Koro-sensei's face pops out a hiragana Ki. His baby picture is photoshopped with Itona in the crib. Goku-Itona faced off against Raditz-Koro. Kenshiro-Itona stands in the spotlight while Raoh-Koro handles his black horse in the distance. Pegasus-Koro is grappled by Andromeda Shun-Itona. The class gasped. "B-Brothers?"
The man in the white suit beside Koro-sensei chuckled. "I hope to see you bond as brothers". Shiro covered his face with his white gloves.
Itona bites his toffee wrapper. "There's no need to pull some tricks and schemes. For sure I will beat you. After school".
Itona and Shiro walked out of the classroom. The class screamed. "Koro-sensei. You didn't tell us you have a brother".
"Please, this is my first time hearing it", Koro-sensei said. "When I was little, I asked my parents for a brother and they were worried about the standard of living. I lived as an only child".
"Wait, you have parents?" a boy in the class said. Whether Koro-sensei has a brother or parents is the question.
=itl=
Itona took his earlier seat. He brought a mountain of snacks. Crunches of food can be heard among the class.
"He sure likes his sweets", Maehara said. "For some reason, he made me think of Koro-sensei".
"And what with his opaque expression", Isogai shuddered. "That's Koro-sensei to a tee". The boys eat their lunches.
Koro-sensei stops his chewing. He puts his mountainous sweets to the side. "I don't like how I'm being compared due to the brother thing". He pulls out his magazine. The cover has a woman in a green bikini. "Time to unwind as an adult".
Itona also pulls out a magazine. It's the same one. "They even like the same big boobs", Okajima said. His fist pumps and his eyes shone. "His credibility just sky-rocketed".
"You think so, Okajima-kun?" Nagisa said.
"Yeah, we boob brothers stick together", Okajima shouted as he pulled out the same edition.
"Now it's three brothers?" Nagisa screamed.
"But if they are brothers, how come they don't know each other?" Kayano said.
"I think I have an explanation for that", Fuwa chuckles. She pulls out a story book.
Once upon a time, the King and Queen of Octopia had two sons; Koro and Itona. They love both sons equally. One day, the Kingdom of Sharks waged a war. The King strategized and fought hard for both his kingdom and his family. Yet, the powerful admiral from the Kingdom of Sharks was able to seize the main palace. The princes have been found. Koro and Itona were thirteen and four respectively. They ran towards the bridge. Koro, who had experience in sword fighting, stayed to face the enemy. Itona was to cross the bridge. Unfortunately, the older brother Koro was shot by an arrow. He fell into the water and got swept by the river. Itona tried to call for his brother but to no avail. He too had to escape from the battlefield.
"And that's how the two brothers can only meet today", Fuwa said.
"Right. Then how can one of the brothers be a human?" Kayano said.
"Because of albino-ism?" Fuwa said.
"Why is there no consistency?" Hara said.
A small tap on Fuwa's shoulders. The girl turned her head around. "Fuwa-san", a girl with twin-braids is in front of her. Her glasses glinted. "That's not how albino-ism works".
She draws a diagram. "For albino to work in a family, a certain body component should be examined. For example, the eyes. Koro-sensei's eyes is black, while Itona-kun's eyes are yellow. Do we know that their parents have black eyes? Possibly, from the picture book they have black eyes. So the trait for yellow eyes is recessive".
She draws another diagram. "Then for their nose. From Nagisa-kun's notes, Koro-sensei has two noses on top of his eyes while Itona-kun has a nose like ours. This cannot be calculated".
She draws two body shapes. "On top of that, the mystery of the human and the octopus body is confounding. Octopus are a species of molluscs and have no backbone. Humans are part of mammals and do have backbone. The probability of Koro-sensei and Itona-kun to either have a backbone and not have a backbone while they are from the same octopus parents is-"
"Okuda-san. Stop", Fuwa screamed. "It's just science fiction".
=itl=
The white man steps into the room. He stretched his hand. "This ring is the battlefield. If you step out of here, you die". The area of the ring is composed of the wooden desks put against the wall of the class. He faced Koro-sensei.
Sugino sighed. "Then the cheater could just break that rule".
"No, that's a very effective rule for Koro-sensei", Karma said. "We witnessed him listening to the rules and taking on the battle. If he breaks these rules, he is dead as a teacher".
"Very well", Koro-sensei said. "Then harming the spectators while in battle can also be considered as death". The spectators are students, Karasuma-sensei and Bitch-sensei standing behind the desks. He faced Shiro and Itona. They nod.
"Start the match after I give my signal", Shiro said. "Ready, set".
Koro-sensei's tentacle was shot down. Itona's hair revealed his own sets of tentacles. A human with an octopus tentacle. Not possible. "He has tentacles?", Koro-sensei said.
"As you can see, they are both the same", Shiro said. "They might have different parents and different backgrounds. Yet they still share the same blood".
"I see", Karma said. "So that's how he's able to bat away the rainwater".
"Where?" Koro-sensei growled. His eyes grew menacing. His teeth are sharp. His head turned dark. Veins popped out of his forehead. "Where did you get those tentacles?"
"Classified information", Shiro said. "But it seems you are angered. Could it have triggered some unpleasant memories?"
Smoky air turned darker. Fog has gathered in one source. "I see. It seems we need to have a little chat". His tentacles regenerate.
"But you don't have the time. You will die", Shiro said. His sleeves reveal a purple light. "This pressure ray will trigger dilatancy in your cells".
Manami gasped. He said that as if it was so easy to figure out. A light that can immobilise Koro-sensei. If she had known from the start, she could have used it.
"We know it all", Shiro said. His thumb moves down. "All of your weak points".
Itona's attacks increased. At first, Koro-sensei had been able to fend it off. Itona starts a focus attack. Koro-sensei screamed. White tentacles beat yellow tentacles. The class gasped.
"Did he get him?" Muramatsu said.
"No", Terasaka said. "Look".
Yellow opaque coat of skin lies on the ground. Koro-sensei heaved himself up on the platform of the ceiling.
"Right. You have that skill", Shiro said. "It does not show, but moulting exerts lots of energy".
Itona stretched his tentacles to Koro-sensei. He dodged. "The speed you are so proud of decreased. Also, you regenerated after Itona cut off that arm. That uses stamina as well". Koro-sensei only bared to defend himself at Itona's relentless attacks. "At this point, you are on par in terms of physicality".
Itona continued his attacks as Koro-sensei continued to defend. "Your use of tentacles depend greatly on your mental state. Having been shocked by a second tentacle user, it's plain to see who will be the winner". Shiro opened his sleeves. "Also, he has the unyielding support of his guardian".
Itona flips in a hamster rotation. Six of Koro-sensei's tentacles are cut off. Shiro chuckled. "You will have to generate your legs as well. What a perfect target to kill"
"It seems I am much stronger than you, onii-san", Itona said.
Koro-sensei stands up and catches his breath. He regenerates six of his fallen tentacles. His stamina has decreased yet again. Itona and Shiro are close to killing Koro-sensei. Much closer than how everyone has attempted to kill him. Manami looks at her desk. The green knife she obtained from Karasuma-sensei this March is hedged between her pages. Could this be the last chance to kill him?
"It seems your legs are back. That is another stamina point down", Shiro said. "Don't worry. You will be left limbless by the time we finish with you".
White tentacles shot up at Koro-sensei. Another yellow tentacle is for the taking. Splutters of tentacles are on the ground. This time, those tentacles are white. Itona gasped. "Not possible", Shiro said.
"Oh my", Koro-sensei mused. Yellow tentacles hide his smirk. "Seems that I have stepped on something you dropped".
A number of green knives lie on the ground. Manami looks at her book. The knife is no longer there. She saw Nagisa clutching his hands. He looks confused. Their teacher had both of their knives.
The shedded skin lands on top of Itona. Koro-sensei caught him. "If these anti-sensei knives work on me, then they could also work on you. And the loss of a tentacle makes us both speechless".
Koro-sensei stands in pitch position. Manami looks at the red head beside her. He covers his upper body with his cardigan. He looks at her. She ushers him to move closer. Koro-sensei threw the sack out the window.
"I have covered you with my once-in-a-month skin shed. You should be unharmed", Koro-sensei said. Itona moves the cover from his body. "But your feet are outside the ring". Koro-sensei's face is yellow and green. "That means according to the rules, I win. You can't kill me anymore".
Koro-sensei stands. "If you want to attempt to kill me, you will have to follow the class. Stay and learn in this building. It's something that can't easily be cramped by calculations; the experience gap. I have lived a lot to learn a lot and to pass down the knowledge to all of you. If you don't take my experience here from the classroom, you will never be able to beat me".
Itona raged. His tentacles turned black. "I'm strong. These tentacles made me stronger than everyone else". Itona lunges for Koro-sensei by the window.
Shiro shoots him down. Itona was taken away. Koro-sensei was not able to stop the two as Shiro wore a white cloth fabric that is anti-sensei material.
=itl=
"You were really serious back then", a black haired girl said. Hazama stands in a position that is similar to Koro-sensei when he's mad. "Where did you.. where did you get those tentacles?"
"Please. Stop it, Hazama-san", Koro-sensei screamed. The class is being cleaned. Koro-sensei covered his blush with his tentacles. "I'm the airhead type. I shouldn't break out of character".
"He's ticking me off", Sugino sighed.
"That was quite surprising", Bitch-sensei said. "How did that Itona boy get his tentacles?"
"Tell us, Koro-sensei", Isogai said. "How are you linked to them?"
Koro-sensei stands in the middle of the room.
"You have always dodged questions about yourself", Hayami said.
"Yeah, and that got us thinking", Sugino said.
"Yes, aren't we your students?" Kataoka said. "Our bonds this past month earns us the right to at least know you better".
They're right. Whatever Koro-sensei is hiding, no one will laugh at him. Manami and Class E knows him more because of the earlier fight and the assassinations that has happened during these two months. Koro-sensei can trust them.
"Very well", Koro-sensei said. "You might not know it, but". The class leaned in. "I am an artificial life form".
"Well, yeah", Fuwa said. "And?"
"What?" Koro-sensei said. "I thought you would be more shocked".
Okajima hummed. "To be honest, there aren't any other octopuses who can talk and move at Mach 20 speed".
Hara tapped her chin. "And if you don't come from outer space, then that would be the other reason".
Kataoka sighed. "And if Itona-kun said that he's related to you, then he must have been created after you". Ritsu hummed from her phone.
Koro-sensei gasped. "Oh my God, you kids are too sharp. At least be a little bit more excited about science fiction".
Happy birthday, Itona-kun!
Character info (by Manami):
Horibe Itona
The transfer student who claims to be Koro-sensei's brother but isn't. The similarity they share is that they both have tentacles, in which Koro-sensei seems sensitive about the origin.
Shiro
Itona's guardian who knows a lot about dilatancy ray and the origin of the tentacles. What else does he know about?
Hazama Kirara
The girl with the long curly hair who sits two seats away. Apparently likes to tease Koro-sensei's not so cheery side.
Koro-sensei
He said that he's an artificial life form..
DISCLAIMER: I do not own Assassination Classroom. Assassination Classroom is a series written by Yusei Matsui. The anime is produced by Lerche. This is a fanfiction to provide a character spotlight on Okuda Manami. Themes and characterisation may differ from the original series. Also uploaded on lavender1112 blogspot and AO3.