A/N: Hello! There will be a re-editing of this chapter because of plot changes, but it is just minor changes.

Flashbacks are in italics.

Tadaomi Karasuma, the commander-in-chief working on the Ministry of Defense, had received a shocking news in the wee hours in the morning.

"That's impossible, sir. The octopus couldn't have a child, not that I know of. He never told me he has a son when he told us his past."

Tadaomi Karasuma couldn't believe what his superiors told him on the phone earlier that day.

"It was actually confirmed, Karasuma-san. The child was truly the child of the moon destroyer. We even had a DNA test on the child, it was a match to the deceased target." His superior had replied to his countless questions that was budding in his mind.

Karasuma had massaged the bridge of his nose has he listened to the speaker in the other line, "But you said that the child couldn't be older than seven. The octopus died nearly 7 years ago. How could this happen?"

The speaker had paused before he slowly explained the situation with professionalism, "Yanagisawa Katara-sensei, the respected scientist and inventor who disappeared in the scientific spotlight for seven years, had confessed that her older brother, Yanagisawa Kotarou, had a secret research that he had been working on since the moon incident, that even the target had never knew of. They had created a child using the target's DNA and Yanagisawa-san's fiancée's egg cells to test if the antimatter genes can be passed through generations. It was unethical, to say at a least."

"That means...the octopus never knew the existence of the child?"

Karasuma has a million questions in his mind, and this is one of them. Koro-sensei had never told anyone that he had a child, even after he had told his back story to them. That means he had died not knowing that Shiro-san, real name Yanagisawa Kotarou, had unethically made a child...the octopus' child with that closest friend of his, who is the former Class E homeroom teacher.

"Affirmative. The target never knew about it," his superior had sighed, "Apparently, according to Yanagisawa-sensei herself, her brother had made not only one, but two children on the experiments. Unfortunately, she only escaped with only one child when she decided to whisked the twins away while the laboratory was in chaos after her brother's failure to dispatch the octopus. She raised the boy in secrecy until the boy turned seven years old."

"WHAT?!" Karasuma's black eyes had widened at what he had heard. Not only he had found out that there are actually TWO children made by that bastard named Yanagisawa Kotarou for experiments. "Does...the boy knew the existence of his twin?"

"Unfortunately, she never told the boy about his twin. Yanagisawa Katara-sensei was so devastated that she never had the chance to get the other child away, that she never had the guts to tell the boy," his superior spoke with pity.

Karasuma shook his head. Of course, he knew the feeling of losing a loved one. He once had a little sister, but she died before she had a chance to grow up into a fine lady. Karasuma was very devastated over her death, he loved his little sister so much, she was his inspiration to become a soldier.

"I also have to tell you this, Karasuma-san. We also found out that the child sometimes has his...bad moments, according to our observation. In fact, he still has no control over his extraordinary abilities, and we were worried it will cause damage and injury on himself and those around him."

The military man's eyebrows were now knitting in frustration. This day is already weirder and weirder in a second. He thought that after the octopus had died, he will never going to deal another incident regarding to him anyway. But no, the octopus's own children will be going to kick it off all again!

But Karasuma was still confused about the twins. "I had still confusions of this, sir. When you said twins, this means the octopus has twin children?"

"Negative. According to the documents that the female Yanagisawa-sensei had given to us, his twin sister was technically his half twin sister only. They only shared a birthday and a mother, both actual and surrogate. The girl was actually the daughter of Yanagisawa Kotarou."

Now great...That bastard has made a child of his own.

"So... Why have you called me, Sir? I am sure this is not just about because I am involved with the octopus years ago?"

"I know it is a great favor to ask of you, Karasuma-san, but... I need you to contact your former students again. They need to handle this problem as soon as possible. I'll send the files of this case later on."

Karasuma had narrowed his eyes once again. Now they had to involve the children, after 7 years. He may be busy right now, but he and his wife Irina still has contact over their students. They were now successful in life in their chosen careers...and the government will need them again...to deal with this once again? Karasuma shook his head, he wanted his former students to live a peaceful life, after what happened years ago.

"Sir, do we need to assassinate the child, like we had done to the octopus years ago?"

"Negative, Karasuma-san. In fact, we need the child alive for science and military purposes. The tentacles implanted on him was a special kind of tentacle cells made from antimatter, and we would like to know the benefits of it so we could use it to our advantage. As the scientists had found out that the child has a low probability of exploding, which the problem with the child's father. Considering the fact that the child was still young and inexperienced in using his powers, we can't do it or we will be criticised by the world once this problem will go out, just like what happened to that octopus. It will be a crisis that we want to be averted. That means... You and your students will take care of the child and teach him to control these powers of his."

"What?!"

"Karasuma-san, the child has to be taken care of. Don't worry, his growing powers were limited by the device in his neck, invented by Yanagisawa Katara-sensei herself. It was made to limit his powers to avoid damage to himself and others."

"But..." He sputtered while he sat down in his chair. Now great...

"You know you can't reject this case. This is an order of the higher authorities."

Karasuma sighed as he massaged his aching head while his other hand was holding the phone. He can't refuse the order, now he had to deal this problem again.

"I will be expecting the file and the child in my custody today."

The speaker's voice seem to be happier when Karasuma had accepted the mission. "Good. Good luck on this mission, Karasuma-san. You and your students."

Then the phone hanged up, as Karasuma looked at the picture of his wife Irina and their little 5 year old daughter, Aimi.

Karasuma grabbed his phone and had dialed his former student to talk to him. Now the assassination classroom will be reunited once again after many years...for another mission.

"Hello, Nagisa-kun. Bring Kayano-san and let's meet at the former Class E building this afternoon. We had something to discuss..."

A/N: Welcome to my newest fanfic, and this time it will a AU Next Generation Series!

This story is a next generation AU-ish AC fanfiction featuring the original AC characters...and some OCs, namely Tsukiro Yukimura ("son of the moon", son of Koro-sensei and Aguri through in-vitro fertilization/experimentation) and Aimi Jelavic-Karasuma ("beautiful love", daughter of Tadaomi and Irina)! This idea was born after seeing a comment in a KoroGuri YouTube AMV, and I can't wait to write about it.

There will confusions in this story, but I will try to polish the concept. And oh, there will be plot changes on this.