With a tragic conclusion from their Training Camp, the students were surprised about what had happened that very night. With two casualties in tow, Jiro and Hagakure had suffered a little while Midoriya was in pretty bad shape. Among the students, Pixie-bob had the same fate as the other students.

More over, 2 students were kidnapped by the League of Villains, namely Bakugo and Y/N. Jack and Senkai couldn't even believed that they had completely failed to save their friend as they had watched helplessly in doing so.

Morning came as the students went back to their respective homes, canceling the training camp to sort out the mess that the League had made.

In a dark room, hiding from the outside world, there was a figure sitting down on a chair, all tied up as he was knocked unconscious.

???: Looks like you bit the dust there, friend.

A voice said as the figure jolted up, hearing the voice that was familiar to him. Too familiar to be exact.

???: Aww, did I disturbed your little beauty sleep? Do you need 5 more minutes to think of how you fucked up?

The voice said as the figure tried to move, only for him to be restrained, making it hard to get up or break away from his bindngs.

???: I wouldn't do that Y/N if I were you. Oh wait, I am you.

He said as he laughed as Y/N was lost, the voice that he was hearing, as if it was him talking.

Y/N: Who are you! Stop toying with me! Show yourself!

He demanded, hearing his plea as the voice answered back.

???: As you wish, your majesty.

The voice said as out from the shadow, a figure emerged, having the same features as Y/N as he looked at him.

Y/N: Who are you!

Y/N(?): I am you. But, you're not me.

He said as he laughed, while the original Y/N just looked at him, trying to process what  is happening as the other him started to lunge at him, only having Y/N to shot wide awake.

Swartz: Took you long enough to wake up.

Y/N: What did you do to me!

He asked as Swartz walked over to him, his hands on his back as he looked at the H/C haired teen.

Swartz: I haven't done anything, yet. But, by the looks of it. Your other self is slowly being made.

He explained as Y/N was lost in his answer, trying to puzzle it together as suddenly, Swartz started to punch him across the face.

Pain started to feel his body as not long after, Swartz continue his onslaught of attacks. Swinging his fist left and right as he made sure that Y/N is badly beaten.

Elsewhere...

Sougo: I understand your frustration, but we don't even know where to start.

The brunette said as Jack slammed his hands down on the table, anger was building up in his system as Senkai stood quiet, gripping the hemp of his pants at the sight of how they loss their friend.

Jack: I don't care! We need to get him back! Who knows what things have done to him!

Senkai: I agree with Sougo. We don't even know where to start Jack.

He said as Jack clenched his fist as he sat down, still mad about the recent incident.

Geiz: Have you seen the news lately?

Sougo: Yeah, UA is having it rough about what happened. Way I see it, the reporters and media will go crazy about it.

He said as the thought of the recent interview of the teachers have gone on air, thinking about how would their school handle such an issue.

A little later, a knock on the door was heard, hearing about this Senkai stood up and answered the door, on the other side stands Aruto alongside with Izu.

Senkai: President, Izu. What are you doing here?

He asked as Izu bowed towards them as she looks at the crowd gathered in the room.

Izu: I believe I have found Y/N.

Back to Y/N...

Pain, blood, and bruises. Those where all Y/N endured as he was kept with Swartz in his location. The chair he was on had already fallen down with him.

Y/N: Why are you doing this!

He asked as he groaned in pain, but he didn't answer, instead, he asked a question.

Swartz: Do you want to know what happened to your family?

He asked as he cracked a grin, to him, he was just toying with him. But for Y/N, he had longed for an answer about the mysterious disappearance of his family.

Y/N: How did you know that?

Swartz: Simple.

He paused as he slowly walked towards to him, grabbing his head by the hair as Swartz looked at him.

Swartz: Because, I was the one who made them fall to their grave.

He said as he lets go of him, having to hear straight from the culprit himself made Y/N's blood boil over it. Dark energy started to swell inside him as Swartz smiled at the scene.

This was his breaking point, all of his memories filled with his family came back to him. How he had found out about the accident, their bodies at the morgue, and the funeral was too much for Y/N to bear with.

Swartz didn't waste any more time as he made time stood still, halting Y/N from moving.

Swartz: It's easy how someone can manipulate your emotions. Guess it was your family's greatest tragic passing is your trigger.

He said as he stabbed his hand on Y/N's body, absorbing the dark energy in his body as it overwhelms Swartz.

Swartz: Amazing! This is the power I have been looking for!

He said as he laughed making his work nearly complete with Y/N.

Outside the location...

Jack: Think this is the place?

Senkai: Probably, this is where Izu har said.

Both of them were walking at an abandoned building as they were searching for Swartz. Their main focus was to find their friend. They had thought about asking for help with Y/N's classmates, but after what they heard from the hospital, it seems like some students from 1-A had the same plan.

Swartz: Looks like you two showed up after all.

Swartz said as he the two riders looked at them, standing their ground as they look at him.

Jack: Where is Y/N!

Jack said as Swartz looked at him, cracking a small smile as a figure started to head towards them.

???: I didn't know you care for me that much Jack.

The voice said as the two riders looked at where it came from, seeing a figure that looks like their friend was a relief, only him having a jet black hair as the two of them looked at him.

Senkai: You're not the real Y/N. Who are you!

???: Oh? Don't you recognize me Senkai? It's the hair right?

He said as he laughed a little bit, but Senkai isn't having none of it as the doppleganger looked at the both of them.

???: Shame, and to think that the real Y/N would love to see his friends die in my hands. Build.

He said as out comes the same driver that Y/N was using, only this time, he was holding a device in his hand, pressing the blue button.

Hazard Trigger: Hazard On!

He placed the device on top of the driver as he placed the familiar fullbottles on their respective slots.

Build Driver: Rabbit! Tank! Super Best Match!

He then started to crank the lever as he cracked a small grin at them, having some kind of black containment unit ready to crush him in between.

Build Driver: Are you ready?

???: Henshin.

Build Driver:  (Techno rock music) Uncontrol switch! Black Hazard! Yabei!

The figure turned into Build, only having it in all black as a powerful force starts to fill the area.

Swartz: I trust that you'll handle the both of them here.

???: You don't need to say that twice. From here on out, my fight is my fight. I'm not fighting for you. I fight for myself.

He stated as the two teens were surprised at what had transpired in an instant. Their "friend" was siding with the enemy at the span of the incident. What did Swartz do to him?

"I am Aku, The Dark Kamen Rider. You will all bow down to your graves."