This takes place from BoBoiBoy the movie after Bora Ra's defeat.

Where BoBoiBoy, Gopal, Yaya, Ying, and Fang were younger.

BoBoiBoy: it doesn't matter what lies ahead. As long as we stick together, we can overcome anything.

Which the others agree.

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"When was the last time you ever Beat the toughest villains? Oh wait... You never did. Because you're all nothing but, LOSERS! Yet... Is this what you repay me? Make myself suffer some consequences, After I saved your lives for gazillion times already?"

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"I realized that being a hero was nothing but a mistake. I'm actually sick of helping the weak, they're just not worth it. Even you guys. You're no hero, you're just a weak LOSERS. "

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"I hate you all... Your mere existence is the reason I became like this. It's your fault that I ended having scars all over my body, because you never care. That's why I chose a path of a dark side. For now, you all shall pay."

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During the event of the war against the Knight Empires...

BoBoiBoy has turned evil and became Kurai. Thanks to the 4 who indirectly caused this mess. Where he has sided with Excaliborg.

But this won't last as he was soothe by the watch wearers, MechAmato, Ochobot, GiGirGirl, and Adudu, aided by the TAPOPS members, to redeem him. Which they all succeeded.

However, Excaliborg wasn't so happy about this. So he steals BBB's dark powers and Fang's shadow powers, to use them to defeat all the TAPOPS members.

Leaving All of the watch wearers and the TAPOPS members are left defeated, after being overpowered.

While BBB is being held by Excaliborg, where he uses dark powers to kill the boy out of existence.

Leaving everyone to helplessly watch BoBoiBoy being murdered by the hands of the villain.

"BOBOIBOY!!!!!"

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Gopal is suddenly awakened in his room from the shock and realized he was having a nightmare.

But then, he realized that it's a memory of the past incident.

Making him cry in grief, but in guilt at the same time on the bed.

Since he was involved in this mess, and his inability to help his closes friend who was always there for him.

"*Starts to cry* I'm sorry BoBoiBoy... You died because of me...! You always make sacrifices, while I couldn't pay a price... Which you keep putting yourself in danger because I was useless...! And I was being such a selfish friend! All I used is to think about MYSELF!!!"

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Meanwhile on the Alphas academy from planet Astropolis...

Jericho is suddenly awakened and finds himself in a sick room. While wearing patient attire as he's in a coma.

Wondering how he ended up being in this room, he remembers that he was attacked by Mercury.

And ended being caught up by one of his poison, after trying to save Lumi from being hit by the poison.

But now, Jericho no longer felt the pain from it anymore.

Then, someone has entered this room. To his surprise, it is his classmate, Mei who's wearing medical attire. Since she was one of the few students who participated in a mission as he does.

"Mei? What are you doing?"

"Well, I'm here to treat your injuries of course."

"So you're working here as a doctor?"

"I am expert at it after all. I can be a specialist, a student, and a doctor, at the same time. As I managed to get you recovered from the poison effects. Even your burned marks are also healed."

Which he check on the shoulder that was caught by the poison, was completely healed.

Even tells him that the rest of his body was completely healed after Jericho was hit for a 2nd time.

Which impressed him from her medical skills.

Mei: hold on for a second. I have to scan you first.

As she tells him to stay still, Mei uses her eyes to scan his body.

While analyzing him,

"Ummm... Excuse me, Mei."

"Yes, Jericho?"

"I hate to be rude, but, are you some kind of a... Robot? *Since he has last saw her in battle during their mission.*"

"Oh no. You're mistaken. I'm a living being like the rest of you all. As it's only just my power that I can generate various machinery from my body since I was born with it."

"I see."

Then, when she sees the results from her eyes, Mei informs him that he's in good health from the poison. And no broken bones.

However, she informs him that his body is still weak and needs to rest for 1 week until he would be fully recovered.

Much to dismay Jericho as he would miss most of the important topics in the class, as he needs it to reach achievements of becoming a top-ranked specialist.

Mei: but what's more important is that you're still alive from the poison effects.

Jericho: 💢 I would blame Mercury for this... 🤔 Which reminds me, where is he after I got myself in a coma?

Garu: no need to worry about him anymore, as he's no longer a part of this class anymore.

Jericho turns attention to see Garu, along with Angsa, who arrived to see the condition of the human boy.

Explaining the whole situation from the incident that Mercury's actions have led him from getting expelled. While the white-haired boy has been in a coma for 3 days.

Mei may have treated him, but it was Mercury since he was demanded to remove the poison out from his body, before kicking him out.

Garu: Mercury may no longer be a part of this organization, but his younger sister decided to leave as well. Just to follow him.

Jericho: he has a sister?

Angsa: her name is Mirage, the one who has the same pale grey skin as he has. But has white messy hair with grey tips. And she was in the same class as you and Mercury.

Which he remembers when her name was mentioned by her brother during their ceremony. While he seems to be afraid of her.

But the boy is still upset about missing out on most of the classes.

Jericho: I'm still can't believe that I'm gonna miss classes.

Garu: don't worry about it, it's only just one week.

Angsa: I had brought your books for you to study. *places the books on the table that's beside him*

Garu: and I have brought your space mouse (Coco) to keep you company. *Hands Coco, that is out from it's cage, to Jericho.*

Mei: but what's more important is taking care of your condition of yourself. You need to be rested. So you'll have enough strength to be prepared for your next task in the class, as it's not going to be easy from before if your strength is fully recovered.

Jericho: Well, okay then...

Garu: get well soon.

So Garu, Angsa, and Mei leave the room. The white-haired boy is left alone in the room, with Coco in his hands, while grabbing the book to read.

Then...

Someone has entered this room.

???: Hello? Jericho?

Jericho: eh? Oh Lumi, it's you.

She entered inside to see him. Wanting to check on his condition.

"How are you feeling?"

"I'm alright. I was able to recover from the poison effects. And I have my friend Coco with me."

"Co... Co...?"

"Well... It's my pet space mouse that I come up with a name for it."

"Oh..."

"But anyway... And I'm glad you're okay."

"But it was my fault for getting you into this. If I should've avoided that attack, you wouldn't jump in to save me."

"Don't say that. What matters is that you're okay."

Lumi notices that he's in good condition as he's started smiling at her, Which is so unlike him when Jericho first arrived.

He started out with his gloomy, anti-social, and cynical behavior, then he started to become more caring for others.

Which she wants to ask him about it.

"You started to care for them, even though they don't want a human around... But What makes you want to join the operators?"

"I just wanted to become stronger, so I can stop bad guys from hurting people at all cause."

"Really?"

"*starts to look down and sighs*😔 ... No... It's just that... I have good reasons and I have to confess... I don't know who I am, and I don't remember anything from the past."

"You... You don't?! Do you have amnesia? Aren't you worried about your past... Or your family?"

"Well... There's something in my head. As it felt like I had experienced something horrible that makes me feel anxious if I tried to remember something. Like I had traumatized on something. But I don't know what it is..."

"😟..."

"That's why I want to join this place since Angsa brought me there. So I'll never be treated horribly if I wasn't been so weak. While discovering about my true self has to wait until I get stronger"

"So that's the other reasons on why you never wanted to socialize with the others."

Jericho is hesitant for a moment until he replied.

"That has something to do about it. It's like I was... Betrayed... But I don't know why... Nor on who they are. That's why I can be very hostile to anyone I don't know..."

"... No wonder you were always been making a sad and depressing look of your faces from the past few weeks since you first came."

"Well... Not only that... I may not remember anything but, I can feel like I was actually... guilty... It's like I had done something wrong. I think because... I was consumed by hate..."

Which surprises Lumi upon hearing something from him.

"😧 Have You Tried Using... Revenge?!!"

"Ummm... I don't remember if I had done something like that... Maybe I had once done. But I don't know how I did it."

"Then you shouldn't!"

"Why did you start to overreact?"

"Because revenge can lead you to the biggest mistakes of your life!"

"😰 Uhh..."

"😤 If you don't believe me... Then let me explain everything to you. I once tried to get revenge on someone."

"Really? To who?"

"I rather not want to mention that name, because that gives me nightmares."

"Okay... Then you don't have to tell me that name. If that might be an awful person."

"Indeed he is! And do you want to know why? He is responsible for destroying my home planet."

Which the boy becomes shocked in horror.

While Lumi explains about her past.

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15 years ago when she was a baby, she was found and raised by a kind alien woman and became her adoptive mother as they become close like a real family.

However, when Lumi grows older as a child, she has discovered that her kind and birth parents were wiped out by the hands of the villain who had destroyed her home planet.

While she was safely evacuated by using the escape pod.

Believing she might be the last being of the galaxy.

This discovery had caused her to develop a vendetta against the person for destroying her kind. Which secretly wishes to get rid of him out of existence.

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When Lumi becomes 12 years old, the person that she hates arrives to invade her adoptive hometown, Lumi tries to attack him. Not wanting him to succeed.

But this is against her adoptive mother's wishes, as Lumi couldn't win against on how powerful the evil person is.

Which her recklessness endangered someone as her adoptive mother risked her life protecting her adoptive daughter, but she gets killed in the process.

Lumi was left with a full-blown mental breakdown for the actions that she has brought, and regretted for being blinded by vengeance that endangered someone.

Before she was rescued by the specialist from Alphas operators and was taken to the headquarters.

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Upon learning from her mistakes, Lumi swears to never be consumed by vengeance ever again. Realizing that she was still a weak young child, who wasn't strong enough to protect people. And also made her neglect someone she cares for.

So she decided to join Alphas operators, to become stronger so she could face the person she hates when getting older after becoming a specialist.

But also learn the value of teamwork, as she wouldn't stop the powerful villain on her own.

Also must prioritize on keeping everybody safe, or out of trouble first. As there is somebody else who became victims from the same villain. Fearing this would cause the same tragedy like it happens to her.

While honoring the memories of her adoptive mother.

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Once Lumi finished explaining to Jericho, tears starts to release from her eyes. As she's about to cry from remembering her guilt from the past mistakes.

Making Jericho feel sorry for her.

"I'm so sorry, Lumi..."

"*wipes off her tears*... No need to be... Sometimes, it happens... But What's more important is that you have to learn it from. As I shall never want to use revenge ever again... But I'm still determined to stop this man from making people suffer from his clutches. Once I'm gonna become stronger, and I swear that I'll never be a burden to anyone ever again."

"... You know what? This has something in my mind that reminds me about my missing memories like I can be a burden to someone for breaking promises. But this is also my motivation on why I want to join the operators because I realized about my true feelings if I need to follow. Helping people is much more important."

"Yeah... That's exactly why I joined the operators for good reasons. You know what I mean, right?"

"Of course I do. You became a specialist for good reasons. Which I'm impressed. Also, I'm glad you're not like the others who looked down on me, since they don't want a human around, and thank you for understanding me."

"It's no big deal. After all, you're not what the others who had thought about you. Since you risked your life saving me, at least you're okay now. But I promise to never be a burden to you or anyone else, as I'll never leave someone behind."

"I guess you're right... Which makes me want to make promises of it, I'll never want to let anyone down, and I'll never want to break it."

"That's good to hear, Jericho. It was nice knowing you."

"Yeah... Me too..."

"Well, I hope you get well soon."

"😓 But I'll get to miss most of the classes for 1 week..."

"But your body and your health need to rest first. It's important to take care of yourself."

"Oh okay. Thanks anyway, Lumi."

"No problem. I'll see you again when you're recovered."

"Sure."

After waving each other goodbye, Lumi left the sick room.

Once she closed the door, Lumi becomes satisfied as she got a chance to have a conversation with him, since she intended to get to know the human boy.

"I'm so glad that I get to talk with Jericho. He seems to be a nice person... But then... I started to wonder where Mercury is after he was kicked out. He might have a grudge on Jericho since he was involved in the incident..."

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Meanwhile...

Mercury is in the alley where he's having a conversation with someone.
Who is wearing a mask that covers face and has a black cloak.

As he's offering to make a deal with a masked person to raid through Alphas operators headquarters. So they could steal something from them.

While wishing to take down on this organization, as he claims that he actually hated that place.