On the outskirts of Sutirushiti, the weather was getting dark, the clouds blocked the sun's rays, it seemed like it was going to rain even outside the walls. In the Black Airship, the steel monster was waiting for a response from the boy he had captured. He had proposed joining him in taking power over the city. He did it only because of the prosthesis that he said belonged to him, but he couldn't use the motor without its vessel. "Answer now you stupid brat, we don't have all day, it will soon be zero hour, say yes and save us so much drama!" Katami yells at the boy.

Seiya, who was with an out-of-order Doraemon, had also heard everything and looked through the cracks of the locker to see how Nobita was with his head bowed without saying anything "I don't think Nobita would join the Baron... He wouldn't do it." the blue boy thinks nervously.

Thesilly boy raises his head with a determined look, for a moment Professor Matsuyama smiled thinking that he had finally gotten what he wanted but... "I'm not going to help you in this horrible plan! Did I really think that because I know that you came up with the idea of the engine I was going to betray the people I love? What would I say something like (Thank you for ruining my life for 4 months, I'm going to help you)? You're crazy, I won't join your plans even if you forced me to! You may have a point that thanks to the engine I'm still alive, but it was because of you that I ended up needing it. So no, I'm not going to help you with this!" The boy had raised his voice again so Katami got upset again, but Seiya smiled so that he knew that his friend wasn't going to turn his back on him.

"How dare you refuse the boss's offer?! I'll have to teach you to obey your creator, you ungrateful brat!" The woman takes out the same device with which she had turned off Doraemon again and was already raising her hand to hit the boy with it, making Nobita get a little scared, tearing up and closing his eyes instantly, but the Baron grabs her by the wrist.

"Calm down Katami, don't waste your energy on him." The baron couldn't stop smiling but it was obvious that the response had irritated him with the tone of his voice. The woman only obeyed, growling while her boss put on his samurai helmet. "It's a shame Heartbreaker, because I really saw potential in you when you immobilized almost a dozen of my soldiers quickly and efficiently. There is a reason why the engine chose you as its vessel, and I deeply believe that it chose you for that potential. I thought that since our last meeting and the truth about your prosthesis you would be wiser and join me, but you are still the same weak boy since the day of the incident that changed your life, anyway. What else can I do? If you don't want to be on my side, then I'll get rid of you and the engine, you're just a nuisance if I can't use you. But first I want you to see how your world falls apart, mental torture is a good way to create the preamble to death."

Seiya sees how the Baron approached the locker, he nervously looks everywhere until he sees the pocket. The steel villain kicks the locker causing it to open revealing the contents, making Nobita turn pale when he sees it: It was his mechanical friend who was lying on the floor. He didn't have his protective suit on, his stomach was without the lid which fell next to him revealing the pocket in it, while inside him were his broken gears, parts and screws while a few sparks came out of him. "D-Doraemon?" The boy says as he started to tear up, the mechanical cat's eyes were dull for obvious reasons, so he proceeds to scream for him "WHAT DID YOU DO TO DORAEMON?! MONSTERS!"

"You didn't like our surprise? I thought it needed a little... Fix. Or is it a breakdown? I don't know, it's the same" Katami says smiling from ear to ear, it was obvious that she was enjoying how Nobita had reacted. "You won't be able to save it little boy, you are trapped and you don't have the necessary tools to repair it. Furthermore, after witnessing the boss's triumph, he will end your life and your friend will end up being melted down to make useful parts. Why do you shed tears for that thing anyway? Is just a robot, are they just replaceable objects for humans like inventions. Or in the case of your friend (WAS) a replaceable object."

"DORAEMON WASN'T A THING AND HE WASN'T JUST A ROBOT, HE WASN'T A REPLACEABLE OBJECT, HE WAS MY BEST BUDDY, BECAUSE OF HIM I COULD WITHSTAND ALL THIS PROSTHESIS AND HE WAS WITH ME WHEN I NEEDED HIM, EVIL GUYS, YOU ARE DESPICABLE!" The clumsy boy screams all this in a heartbreaking and irritated manner, only to receive another slap from the baron's right hand.

It was expected that seeing his mechanic friend in that state was too much for him, but he just lowers his head with a broken voice with his cheek red from the couple of slaps he received now and a moment ago "W-why...?"

"Katami, leave the radio on, zero hour is about to arrive, he will stay here while he hears the screams of the weak suffering under our hand, it's his punishment for not taking the side of his creator." The baron touches the sheath of his katana "And you may also hear how I'm going to do something that I was going to do months ago and that because of a stupid boy and his school project I couldn't do it."

The silly boy raises his head upon hearing this, remembering that in the incident, the Baron was going to hurt Shizuka with his katana until he stopped him with the project ship, which makes him move upset and tearing up "NO, DON'T DO IT, SHE HAS NO THING TO DO WITH THIS, NO!" the boy shouts desperately as he tries in vain to free himself from the ropes.

The baron's right hand approaches the console, touches a couple of buttons to leave the airship on autopilot with a couple of commands, and then locks the navigation console control by removing the key from the manual control and turns on the radio who begins to emit the voice of a commentator:

"It seems that the weather has changed a little this afternoon in Sutirushiti, but that hasn't been an impediment to today's activities. The parade has been a complete success as have the presentations, it's noon and it's time to the mayor begin with the awarding of the Annual Independence Day Patent Contest. Who will be worthy of the immediate patent from the mayor? That will be known at this time."

"It's our signal." The baron approaches Nobita and caresses his head but he can't feel much because of the cap with goggles he is wearing "Don't feel bad, Heartbreaker. Feeling sorry for the weak makes us like them, they will have the same end even if you helped me or not. Let this serve as a lesson to you so that you don't get carried away with empathy anymore. When this is over I'll give you an ending myself, you lost your chance to survive, after all: It was your choice to be on the side of the weak. Let's go Katami"

Both the baron and his assistant close the door to the command room so that no one else enters, leaving a soldier guarding on the other side "Don't let Heartbreaker escape, he will be executed after taking control of Sutirushiti" the soldier nods while that his boss walks away with his henchwoman.

Nobita hears how from the other side of the door the soldier tells his boss how Suchimu Corp was taken, which to him meant that the mission had failed because the saboteurs couldn't be activated and his effort was for nothing.

The boy was so depressed by what was happening that he didn't pay attention to the mayor's speech that he gave before the award ceremony, focusing on his own thoughts "Is this... Is this how everything is going to end? I can't believe that in the end they'll get their way... I was supposed... I was supposed to help prevent this... But now, not only did they hurt Doraemon, but they're going to hurt all of Sutirushiti, they're going to hurt my parents, to my friends..."

The boy while in his mind Shizuka appears smiling at him while the tears don't stop flowing "... Sorry Shizuka, I couldn't protect you, I couldn't protect anyone"

When everything seemed to be lost for the little mechanical disaster, hope comes when a slight movement in the mechanical cat's pocket happens, at that moment a hand comes out of the pocket, which makes Nobita react, who is surprised to see that event, little to little, someone came out of his pocket, making the boy's eyes light up with excitement. "SEIYA!"

The blue-haired boy stands up while stretching. "Gosh, I didn't really think that was going to work, but since I saw that Doraemon was pulling out big things, I had to improvise." Seiya turns around and smiles approaching his friend. "Nobita! I'm glad you're still alive." The boy notices how one of his friend's cheeks was red from the slaps, which made him angry. "Those couple are nothing more than psychopaths with power, I'll get you out of here."

Seiya begins to untie Nobita while he begins to cry "Doraemon. His pieces are broken and now... And now" When his hands were freed the silly boy wipes his tears for what happened to his mechanical friend "The mission failed and they're going to hurt everyone, all because I was careless!"

"Don't be discouraged Nobita, this isn't over yet, remember that we have a good mechanic, I think I saw a medical kit and some tools in his pocket" The blue haired boy smiles at the clumsy boy to calm him down and finishes untying his legs "Go equip you, I'll get what you need to save Doraemon"

Nobita nods and runs to the command panel, he couldn't use it because Katami also blocked the use of the console, so he just bends down and picks up his protective equipment, he notices that Doraemon's was also there and takes it along as well with the guns and their holsters. There was also the saboteur standing like a coin on his edge that he had left hours before, but it was still not connected, although he didn't see it and in the heat of the moment he didn't remember that it was still there. He puts on his equipment and uses the communicator still tearing, with his voice breaking and shaking because he kept thinking that everything was lost "M-Melia! Are you there?! Tell me we can still save this, p-please!"

"NOBITA?! Are you okay?! I was worrying about you 3, not even my brother was answering since he infiltrated that airship to rescue you! They took control of Suchimu Corp, but dad, Dr. Keta, the rescued prisoners and the workers on today's shift are fine, now they are in the abandoned lair that was transformed as a temporary shelter! Hikaru was able to put together another command for the saboteurs and neutralizers for Dr. Keta to use in the hour! 0, so we're still in the game!" Nobita smiles calmer when he hears that despite everything, they still had a chance to save everyone "Mia, Hikaru and me are back in the city, we're heading to the center for assistance together with the Special Forces, if you can 3 to come I would also be grateful!"

"Thank goodness, I thought everything was lost, at least you are still fine with Suchimu. Seiya and I are fine, but they damaged Doraemon, I'm going to repair him and we'll meet there, we have to stop him" Says the boy with the glasses tearing but now with a determined look.

"Ok, but be careful!" Melia says ending the communication. The boy approaches with Doraemon's protective suit towards Seiya who had taken out the emergency kit and a toolbox that Nobita had saved the day before, the boy turns to the robot and sees his state, he tries to do something but the mix of his emotions he had accumulated today didn't let him do anything, being on the verge of having an attack. "W-why don't I know what to do?! My mind is foggy! I can't even distract myself, all this is driving me crazy! I can't, I want to help Doraemon but I don't know where to start!"

Seiya puts his hand on his shoulder to calm him down and looks him in the eyes "Nobita, you are a very good mechanic, you proved it many times, I know you can repair your buddy, it's your time"

"B-but, those times were because I got distracted and let my hands act alone... Now I don't know what to do! I practiced and practiced with the motors that Mia gave me, but now my mind is very foggy! Maybe... I'm slow." The boy with glasses becomes depressed while tearing

"In that case, let yourself be carried away by your emotions this time and make them link with your mind, is what Mia sometimes told you, remember that you have to save him, you owe him, just relax, take a deep breath and concentrate"

Seiya's words echo Nobita, who remembers all the times Doraemon was there for him, both the good times and the bad times, how he realized his talent and how to improve it, how he was next to him in the hospital, who encouraged him not only to confront Gian and Suneo, but also to get closer to Shizuka in a correct way and who didn't leave him alone in the mission.

The little mechanic closes his eyes and breathes deeply leaving all bad thoughts aside, he was having a focus on a goal instead of just letting his hands move on their own, this was the step he had to take. For a mechanic, his work was the only thing that had to be on his mind to do it well and accurately, at least that was what his father told him. Now Nobita had only one goal in mind: Save his best friend.

Since he had the gloves from the suit, he didn't need to use gloves for work, so opening his eyes and with a focused look while he takes off the communicator and puts on the goggles of his cap, the boy begins to look inside his friend. He opened the toolbox and started to work, in the box there were spare parts so he could repair him without problems, at least to bring him back to life, he was no longer distracted but he was doing it in a precise and agile way, having received the course Mia's intensive training had helped him hone that talent and it was working.

Seiya is impressed as he was once again watching how the boy was demonstrating his talent, this time repairing the robot cat, but now with a determined and focused look "Well done Nobita, keep it up, you're getting it" The blue-haired boy thinks while see how he was repairing it.

"Good afternoon ladies and gentlemen, we thank you for having participated in this year's Independence Day events, despite the weather, everything has turned out to be a success for Sutirushiti, I'll now proceed to name the winners of patents this year, we have chosen 3 inventions this year since it has been very close, the first winner is..."

The mayor's voice announcing the winners that is heard on the radio at that moment makes Seiya stand up suddenly while he hears the applause and camera flashes awarding the first winner "It's here, the zero hour! I'm sure they're going to do it after awarding the third winner"

Nobita was putting the lid on the mechanical cat and laying him on his side "It's done" saying while wiping the sweat and motor oil from his face with a little fear of whether he was able to save it or not "Will it have worked?"

"There's only one way to know" Seiya says to which the silly boy sighs nervously and then pulls Doraemon's small tail to wake him up, both waiting expectantly for the result with a tension that could easily be cut with a knife. Nobita was already tearing up because nothing was happening yet, thinking that even though he did his best, he was of no use.

But they both see how the mechanical cat's eyes begin to shine to give way to his black pupils. Doraemon slowly opens his eyes, making the pair smile, especially Nobita, who begins to tremble with happiness. The mechanical cat sits up and shakes his head in confusion "Uh?! What happened? The last thing I remember was that we were in the middle of the smoke in the baron's lair and something electrocuted me from behind, whatever it was must have forced my automatic shutdown. Where is my protective suit?" Doraemon turns to look at Nobita and Seiya "Nobita. Where are...?"

The silly boy suddenly hugs his friend while he cries with joy, which takes the robot by surprise. "Doraemon, you're okay, how good! I was able to focus and repair you without needing to be distracted, I thought I had lost you!"

Doraemon looks at Seiya with a confused look "We are on the Baron's Black Airship. Katami was the one who shut you down but also caused you to break down destroying your parts so you couldn't function again, they tried to convince Nobita to join them, but not only did he flatly refuse but he was able to use his talent as a mechanic without being distracted to repair you, welcome back."

The mechanical cat reacts upon hearing that summary and upon seeing how his best friend was crying in his arms while trembling from the load of emotions, he hugs him with affection "Thank you for fixing me Nobita, I missed you too, I'm glad you're okay"

"I was really scared when I saw you like that, I thought you wouldn't come back, but now I'm really glad that Mia made me practice so much, you're my best buddy, I would never leave you like that" The boy with glasses kneels and they both smile.

"And you are mine, and we will both stop those heartless people" Doraemon touches Nobita's red cheek

"Oh? This? The Baron's right-hand woman slapped me a couple of times for yelling at her boss, but it's nothing if you're okay." What the guy with the glasses said bothers the mechanical cat, who sees the kit first aid, he pulls out a square band-aid from there and places it on his slapped cheek. "Thank you" the boy says as he takes off his goggles and puts on the communicator again.

"I'm going to repay that villain for that electric blow she gave me and the couple of slaps she gave Nobita" Doraemon thinks with an irritated face, it was to be expected that the cat would be angrier about the slaps to his friend than the electric blow he received.

"Nobita, hey..." Seiya is sad for a moment while his friend stands up and the robot puts away the toolbox and emergency kit and puts on his protective suit "About the Mechanical Heart thing, I heard everything while I was hidden in the locker, it's possible that not even my father knew about its past, I understand if you're upset about that."

"I don't deny that that revelation left me somewhat uneasy, but... It's likely that your grandpa took the Baron's Mechanical Engine to put it to good use in what I now have inside my chest and your dad didn't know it, but he did it to help me and I really appreciate that from that day to today and in the future. The most important thing is how to use it, now I feel like we are being one, and the heart and I won't let an evil guy get away with it." Seiya smiles at what Nobita says "And thank you for coming to rescue us Seiya, you really are a great buddy, and so is everyone at Suchimu Corp, we aren't going to disappoint you"

"You're welcome, thank you for giving us your trust despite everything that has happened so far, we must get out of here to launch the counterattack, I'll kick the door and you immobilize the guard to give us time to escape" The blue-haired boy says that with determination while Nobita nods, although Doraemon, who has already put on his suit, doesn't understand anything about the engine issue for obvious reasons.

"Wow, I've really missed a lot" says Doraemon, scratching his round head.

Nobita smiles at him "We'll explain it to you while we go to meet with Melia and the others" the silly boy adjusts his cap with a serious look as he approaches the door and then takes out his pistols "It's time to end all this and be free of the steel monster!"