When there was no one in the school except Koro the government executed the final assassination. When the button was pressed a huge laser appeared and engulfed the whole building, when the laser hit everyone felt a tremor as well, the straw hats sensing something was wrong immediately set out for the school building with the antidote that Chopper just finished for Koro.
In the class, Koro somehow managed to dodge the laser by a hairs breath shocking the government agents. When Koro tried to get out of the area he was blocked by a anti-sensei barrier that stretched out. While the straw hats were running Nagisa and Karma saw the barrier and immediately texted everyone as they were running, though class E themselves were also looking at where the barrier was though when the rest of the students were about to leave their respective homes they received an order by Karasuma to stay where they were.
There were vehicles blocking any entry towards the mountain when the class gathered, they also could not contact Koro. Soon they were at the area where the reporters were, they were broadcasting about Koro to the country they were treating Koro as if he was a monster that terrorized everyone and would destroy the earth if nothing was done. They also said that they took the students hostage after threatening the government they also said that the government while pretending to play along with Koro was thinking of ways to kill him.
With that propaganda everyone thought of Koro as the enemy. When all of them including the straw hats ran towards the nearest entrance they had they saw a large number of troupes stopping anyone who dared to go to the classroom. When the soldiers nothiced the students they were stopping the students from passing. Karasuma then came out telling the soldiers to not be so rough with the students
"Hey what's this about? No information was given to us."
The students were questioning Karasuma to tell them that Koro was holding them hostage so that the students would not need to go through any investigation. While the students disagreed with doing that, the straw hats were keeping silent this whole time since they were not involved in it but wanted to get up and give Koro the antidote so that nothing the government had could hurt him.
Though, reporters appeared trying to get information about Koro with the flashes everywhere and cameras rolling the reporters looked like savage beast. As they tried to defend the teacher they loved the reporters started ganging up on them the straw hats decided it was time to step in.
The class was behind the straw hats while the reporters were telling them to step aside, they soon realized how strange some of the straw hats looked and got footage of them realizing that they must have been the pirate crew that the governments were talking about since it was said that the pirates were working with the 'monster'.
The straw hats who were capable of Haoshoku haki then released a wave of it knocking the reporters out. Robin then used her devil fruit powers and restrained the soldiers. They then headed to the mountain to reach Koro.
In the class, Koro unaware that his students were coming did the graduation album for the students and a special photo album for the straw hats. After he was finished with the cleaning, he then looked out of the window and wanted to see the students one more time.
When they were on the way to the mountain, Robin used her powers and got the information they needed. After telling it to the students, Marco came up with a plan and said "we will go on the day when the security's the weakest within that time line we will train you. So you guys go home and get the uniforms that the government got for you guys because we will not go easy on you guys for the next few days."
When the students were at the straw hats they were brought to the training room which they were trained the snipers were working with Izou. Marco, Thatch and Jimbe were teaching haki and how to conceal their presence. Once they were done with that they spared with the three brothers. The brothers were not using their powers but instead used pipes like how they did during their childhood, despite that, the whole class could not even beat any one of the brothers. The students were glad that they were using the uniform that they received as a gift because they gave n mercy. By the end the classes were eating since Sanji brought food down for them. Although, only Karma and Nagisa were the only ones still training since they were working with each of the straw hats they were given pipes and spared with everyone while they were using their devil fruit abilities. By the time they were done even the could not help them because when they took their shirts off they were covered with bruises and once Chopper was done with them they were covered in bandages.
Over the next few days it was the same pattern, train, eat and rest over and over again. Though when there were three days left the only ones training was Nagisa and Karma. Over the days they were sparring with them to the point they started using swords created by Franky and the brothers were not using their pipes anymore. They were going all out against the two boys, although they still could not beat any of the straw hats if they were in the grand line they were good enough for the time being. On the last day they were planning on what to do when Luffy said
"Let's just go in with a bang!" in which Marco just sighed as there was no stopping his captain.
On the day itself, when they were on the mountain they were taking down the soldiers down one by one the soldiers were unable to even since the students. Once all the soldiers were down they themselves realized that not one of the straw hats made a move yet they were standing one side and letting the students take over. The divine soldier then made his move, when he wanted to take his glasses off, none of the students gave him a chance to do that as attacks were coming one after another. When both Nagisa and Karma attacked him he was down but still conscious as they tied him up. Once they reached the class they all hugged Koro and were soon pushed out of the way by Chopper, he then passed Koro the antidote and Koro drunk it down in one gulp and he slowly changed back into his human form with his clothes fitting loosely on him. Ritsu then created some fitting clothes for him and once he was changed the girls swooned at how their teacher looked they weren't aware that he actually looked hot. They then celebrated Koro's birthday after they settled down only for it to be destroyed by Yanagisawa who came to destroy Koro. Before the fight started Chopper pushed everyone including Koro as he was now a human instead of an un-killable monster. While the straw hats were getting the students to safety, Yanagisawa injected the tentacle seed into himself and when the transformation finished he attacked Luffy but the tentacle was destroyed by Sabo's pipe which was covered in armament haki. Yanagisawa was then kicked away from the class by Sanji. Luffy then went to engage Yanagisawa and started fighting him. The rest of the straw hats were guarding the class in case Yanagisawa tried to take them hostage.
Franky then passed Luffy a bo-staff that was made of anti sensei material, when Luffy got it he went into offensive mode and started attacking Yanagisawa. As Luffy backed away to catch his breath he was shot by Yanagisawa the class wasn't worried until the bullet went through Luffy's body.
"What did you do to Luffy?!" Ace shouted at Yanagisawa as Sanji as kicked Yanagisawa, Chopper was ushering Luffy into the infirmary with Koro following as both he and Chopper operated to get the bullet out of Luffy.
"What did you do?!" Marco said as he pinned Yanagisawa down while Sabo interrogated him. "Sea stone, that's you devil fruits greatest weakness isn't it." Marco had heard enough and threw Yanagisawa to the anti-sensei barrier which he disintegrated in it dying. Although, their enemies were gone, the class still could not celebrate because they were waiting for Luffy to wake up after the surgery. Karasuma was somehow able to convince the government to take down the barrier and not fire the lazer. As they waited for the whole night they looked through the graduation album and the photo album that Koro made with the straw hats inside. After a few hours when Luffy finally woke up both brothers immediately hugged him. After filling Luffy up on what was happening Luffy was glad that everything was over and when the straw hats were about to leave to get their things Karma and Nagisa asked if they could attend the Graduation ceremony.
Luffy agreed and told them that they would catch up with them once they got their things. After the class left Luffy asked Koro to join his crew, Koro was nonetheless shocked that he would be invited to join his student's crew since he actually planned to be on the run from the world till he dies and Robin said "come with us Koro-sensei running for the rest of your life will not be the life you want to live, I can understand as me myself ran away from the government for ten years of my life before finding captain-san." Koro had no words but instead agreed. They then went back to the building to find their stuff all packed up with Dr Yaba waiting for them. The crew then thanked the researcher for helpin them during their stay here, Dr Yaba the said "go and get the rest of your crew I'll ready everything by the gate." They then left for the school
In the hall, when Nagisa went up to get his certificate, the director said "after this both you and the Karma Akabane are leaving to go with the straw hat crew huh, any way's congratulations on graduating." Nagisa then smiled at the principal and said "thank you. Principal, please stay well…. But don't go overboard."
After the graduation ceremony as the students were about to leave reporters were storming in trying to get the news from them. Karasuma and his colleagues were trying to stop the paparazzi and reporters as they tried to get in.
"Give us a comment, please!"
"How do you feel right now?!"
"Were you guys really responsible for killing that monster?!
Then there was a wave that knocked out the reporters and in front of the unconscious bodies were the straw hat crew back in the clothing they normally wore in the grand line though they had a coat on since it was the winter time.
"Come on let's go back to the grand line already!" Luffy shouted as he waved at them. They then had smiles on their faces as they jumped from building's to buildings shocking the virtuous five and the students who were about to help them.
Once they reached the lab the portal had opened and both Karma and Nagisa changed into their regular clothes. After awhile of goodbyes the straw hats finally went back to the grand line but not before Luffy gave them all a hug and gave them an album that the straw hats themselves made.
7 years later, at the school mountain. In Class E were pictures at the back of the classroom in the pictures on the walls were of the straw hats and class E at different timings.
"I wonder how they are now."
"dunno, but they should be having a lot of fun by now while we're here going on with our lives."
"Luffy's with them who knows what might be happening now."
The students of class E was doing one of their regular clean up's after they bought the mountain with their reward money. They missed the straw hats, their classmates and their beloved teacher. Although, they knew that their friend were having their own adventures while they had theirs.
In the grand line.
"Luffy-kun! Ace-san! It's dangerous! Get back here!" Koro said as he shouted at the, as they were having a competition on the sea of who could get more food. Karma, Nagisa and Koro even after seven years with the straw hats were not used to their shenanigans as they sighed while they were being ignored until they both fell into the water which had Thatch and Zoro going into the water to rescue their dead weights before they get eaten by sea kings or due from a watery grave.
That's it imma gonna make a sequel of this which takes place right after they go through the gate
