No one's POV

We now see Naomasa along with the police force in an area, tracking the movements of where the heroes were.

Naomasa: Endeavor, have you found anything?

Endeavor: Nothing yet. It's completely abandoned still.

Naomasa: Be careful. We don't know if the enemy has figured out Atomic Girl yet. Until then, we need to be careful.

Endeavor: Got it.

Naomasa: One more thing I forgot to mention to you guys, since it wasn't important. The spiders that helped break out Overhaul have the ability to blow up. Be careful, as they might try and get in your way.

Endeavor: Understood.

As they keep walking through the line, they manage to find an old subway car, which Kinori notices and smiles seeing.

Kinori: Aw, so cool!

Deshi: Kinori, I know you have a thing for old things, but we need to move! Naomi might in trouble!

Kinori: Awww... But I really wanna-!

Elegant Fox: How about this? If we have time after saving Naomi, and defeating this "Demon King," we'll come back, and you look at it.

Kinori: Kayyy!

The heroes then keep walking through the area, looking around, unaware that one of Riyama's spiders is tracking their every move.

Meanwhile...

Location: Kuoh Occult Research Clubroom

We see Naomi waking up after being knocked out again by Riyama, and notices that she, along with her parents, are stuck in a cage, over a pool of what Naomi's hoping is just a mixture of Kool-Aid, and not Lava.

Naomi: Oh crap...

Naomi does look around and notices a giant monitor in front of her, with a few areas containing some of Riyama's robotic spiders.

As she does, her parents wake up, and Naomi does hug them, glad to know that they're alive.

Tamiko: Where are we?

Naomi: I don't know. But don't worry. I'm going to get us out of here.

Naomi goes to the bars, and right before she tries to activate her Quirk, Riyama stops her.

Riyama: It's no use. That entire cage is built out of Vengestone.

Tamiko, hoping to try and bring her daughter back, tries to speak with her.

Tamiko: Riyama... My baby girl... I don't know exactly the full details of what you're planning, but you don't have to go through with this! You can change your mind.

As Riyama walks up, she decides to mess with her parents.

Riyama: Really, Mom? I can?

Tamiko: You can, sweetie!! It doesn't have to be like this!

Riyama: Are you sure?

Tamiko: Yes! I'm-

Riyama then laughs at her mother, which does make her realize that she wasn't going to do anything.

Riyama: Oh, Ms. Mihonatsu. So trusting, so gullible.

Naomi: You tricked us—

Harumi: And you think you would learn from it? But you haven't, clearly. Because you are trusting, gullible, and weak. Which is why you are DESTINED to lose.

Hiroki: Riyama... Sweetie... I know you think I failed you, and you're angry with us.

Riyama: If, by failed, you mean "neglected me, while not knowing of the bullying, and letting me kill myself by letting a building fall on my your child body," then yes. I will admit, I was pretty pissed off about that.

Hiroki: So direct your anger at us! The ones who hurt you! I know you don't want innocent people hurt. You always said that when you were young!

Riyama: That was the old me. You know NOTHING about the current me. But I know a lot about you, little sister. Deep down, I know there's a darkness within you. You fight it, you try to push it away, but it's there.

Naomi: I... I don't know what you're talking about...

Riyama: Oh right! You don't know about that. And I'm guessing you don't either mother. Our mother comes from the Gremory family, a devil family. We have the Power of Destruction. That's the strong part about us.

Naomi: Our ancestors don't describe what we make ourselves, Riyama!

The computer then beeps, and Riyama activates a camera, which shows the heroes going through the subway tunnels.

Tamiko: How did-

Naomi: It's over, sis. Back before you were going to get "Stain," I had a tracking device implanted onto me. They're gonna find your little subway station, and then it's only a matter of time before they find this place, and your entire plan falls!

Riyama: *acting* What?! No! Ohnonononono! What do I do?! *back to normal* Oh, wait one fucking second! I planned for this!

Naomi: *tiny gasp*

Riyama: In fact, I was hoping this would happen. Which is EXACTLY why I left behind a little surprise for your friends.

Riyama then starts inputting a code, and soon a bunch of dark blue dots and some yellow dots appear. The dark blue dots representing the spiders, and the yellow dots representing the heroes.

Naomi: What?! No!!!

Riyama: There's too much at stake here, Naomi. Leaving anything to chance is something I will not be doing. I'm sorry.

Meanwhile, with the heroes, they keep looking, but Elegant Fox suddenly stops them.

Endeavor: Why did you stop us?

Elegant Fox: I'm... I'm hearing something...

Shoto: What are you hearing?

Elegant Fox: A soft... clicking sound... Almost like... tapping...

Endeavor: Look around everyone! If you see anything out of place, notify us immediately!

As everyone looks around, Endeavor does ask Naomasa to keep an eye on things, as they're worried that something might be coming their way.

Back in the clubroom, Riyama says one thing to Naomi, as a way to taunt her sister.

Riyama: Any last words, sister? Say them now.

Naomi: No! Please! You can't do this! Turn it off!! Rya-nee! Please!

Riyama: I can't, Naomi. I mean, I could, technically. But I really don't want to do that.

Tamiko: Riyama! We'll do whatever the hell you want! Me and your father promised to be better! So please... don't kill Naomi's best friends!!

Riyama: Oh, Mother. You're not exactly in the perfect position to be bargaining right now, are you?

Hiroki: Riyama! Don't do this!

As Riyama's parents and sister plea to her not to do this, she simply smirks and hits a button, as a computer generated voice comes out

Computer: Spiders armed.

Back with the heroes, they keep looking around, and Deshi looks up and notices the spiders, and remembers what Naomasa.

Deshi: Oh no! Spider bombs! Tons of them!

The others gasp, and Endeavor quickly realizes what's going on.

Endeavor: Everyone get out of here! This whole subway line's a trap!

Everyone then starts running back the way they came, but they soon notice spiders are heading this way to.

Elegant Fox: We're stuck. This was all coordinated from the beginning!

Kinori then looks around, and notices the subway car.

Kinori: Everyone, get in! This should save us!

The others are recluctant, but after realizing that a possible way to survive is better than dying, they all quickly get in. Kinori then grabs a pebble, and tosses it as one of the spiders, and causes one of them to trip.

Riyama: Bang!

Riyama then presses another button, causing all of the spiders to start blowing up.

Meanwhile, with the police force, they notice the signals for the heroes disappearing from the map.

Naomasa: What just happened?!

Officer: I don't sir! Cameras couldn't pick up anything, and we aren't able to get in touch with Endeavor!

As the Clubroom in Kuoh, Riyama smiles at what she did, and turns off the computer, looking at her sister and parents.

Riyama: They're gone now. I'm sorry.

Tamiko: No way...

Hiroki: I can't believe it...

Naomi: How... HOW COULD YOU...?!

Riyama: But there's no reason for you to be destroyed too. You  three can still join us. There will be a place for all of you in the dark.

However, they aren't able to do anything, as Naomi keeps on crying on what's happened.

Riyama: Naomi, focus! What's done is done. You have a choice now. You can resist and perish like your friends... or, you can join us, and embrace the power of the Demon King.

Naomi: NEVER!!! I'LL RESIST YOUR VILLAINY WITH EVERY OUNCE OF MY BEING!!! AND SO WILL ALL OF U.A, AND THE TEACHERS WHO WORK THERE!!! THEY WILL ALL RESIST YOU!!!

Riyama: Not for long they won't. I told you, leaving anything to chance is something I will not be doing. I plan to deal with your friends and U.A next. It's all part of this deadly devil's design!

Naomi then starts panting angrily, and a blood red aura starts to surround her.

Tamiko: Naomi...

Hiroki: Sweetie... are you-

They don't say anything, as Naomi yells one thing, while her eyes glow a bright red.

Naomi: *GIF Below* I WON'T LET YOU KILL THEM!!!!

Naomi then starts attacking the cage, and breaks the cell, shocking her parents, as Riyama smiles at this and starts preparing her magic. Naomi then throws the broken cage part of, and starts going for punches, and Riyama starts blocking them with her magic attack, and as Riyama jumps back, she laughs.

Riyama: There we go! That's the spirit sister! Just like our ancestors! Anger makes our powers stronger!

Naomi: D̵̢̳̂o̷̥̰͖͂̕n̴͔͍̬̊'̵̳̕t̸̪͍̋͂͗!̴̡͈͛̓͜ ̷̢̄̽̆Ṡ̶̯͉͈͛̽ä̵̝́͒ẏ̸̟̯̾!̶̯̖͓̈́ ̴̫̰̭͒͒̾T̶͉̕h̸͓̹̍́͘ȧ̷͈̘t̵̠̺͒̐̔!̵͈̏͘

Naomi then unleashes her Power of Destruction, and starts blasting the area around Riyama, to which she dodges. Naomi then notices piece of falling brick, so she uses her power to blast it, and destroy it, hitting Riyama in the head, allowing Naomi to pin her to the ground.

Naomi: D̷͇̜̣̿i̵̠̍̈e̸̩̦͊ͅ!̵̲̺̾!̶͙͙̐͘!̴̪̆͛̀!̷̮̹͋

However, right before Naomi can kill her sister, Tamiko grabs her daughter from the back, not wanting her daughters to try and kill each other.

Tamiko: Naomi! Come back to me! This isn't you!

Naomi notices her hands and starts freaking out.

Naomi: N̵̨̹̤̓̾̕ö̸̬̐͝ͅ.̴͈̘̖́̓͂ ̵̖̍̍N̴̫̙̼̽͝o̷̡̼̺̓!̷̛͓̼̑́

As Naomi starts to shake her hands, she steps off of her sister, allowing Riyama to land a quick blow to her neck, along with her parents, knocking them all out.

Riyama: Welcome to the world... Descendant of Rias Gremory.

To Be Continued...